Malicious PDF — malware analysis report

Static analysis result for SHA-256 68a910187b773c43…

MALICIOUS

PDF

70.2 KB Created: 2021-08-28 11:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ecf5afeb0dc986f73419f0a5aa27d395 SHA-1: e6a3d67e9344700f251c22c8efd744b3a7fef37b SHA-256: 68a910187b773c435e91962b074d4b1b8d2e479a5455b0e3ed35eb3dc0b72abe
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF is identified as a phishing lure due to its small size and image-only presentation, designed to trick users into clicking a link. The embedded link directs to a URL hosted on what appears to be a compromised WordPress site, likely serving a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://sieuthimayphat.com/ckfinder/userfiles/files/76467892139.pdf In PDF document text
    • https://ecohort.info/userfiles/files/risizudunido.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/8ec2080edf012a258f5693fa52d6c4aa/kidoxupebolopagisu.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/sewozavujujuzig.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8737050f75---75452287284.pdfIn PDF document text
    • http://www.asslar.de/downloads/vowevumuv.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608778cfdd04e---misufegati.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/xovawevodigujezunaputug.pdfIn PDF document text
    • http://heureka-cz.eu/files/99161985110.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f0bb77c2d72---mugugojirugidupo.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/53bb024ec173629e891da87a98a163ad/95054419336.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/masebeko.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f260f4645bf---52365273499.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d24d867fb61---59892200328.pdfIn PDF document text
    • https://noblacklist.pro/web/img/podborky/files/tekokaxu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c405c1feaa---45395684004.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/gedizifid.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/64098741507.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/86352399750.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/zimanaxokokovulile.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f6868033f---tifomekiritalo.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/pobatugojukiniviw.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611039dce265a---480582228.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/7ef5o7u2tsgd6e6hb2hte862d4/wiwalodago.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9176f74f32---82311229703.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/kuwivevijutol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+make+your+boyfriend+talk+to+you+after+a+fightPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB705 13936 bytes
SHA-256: 85526fa33d9b4f802a95d677ee5af4e343a191d7c760118120ce48dbbcf9a4e7
font_01_sfnt_off0000d8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DB 11156 bytes
SHA-256: 1139cee8c13222e24515a9c1f68dcc0acb035e97d484bbb11e6764e422d90229
font_02_sfnt_off0000f282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF282 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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