Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7e14bd91213f0fb…

MALICIOUS

PDF

84.7 KB Created: 2021-09-03 23:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 99e61a128ad7beaeb298dbffec24bdfc SHA-1: 0da315c4a2d1620416d31e189604d735599dd4b4 SHA-256: e7e14bd91213f0fb3f9697bd35b01ce53de521bc03f8be0ea545670933ff9c1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe47386be7---75154514485.pdf In PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16097c974a9ea5---gaputanazodoxu.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/62391475520.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/7668601472.pdfIn PDF document text
    • https://edinburghpools.com/contents//files/fedamofoxu.pdfIn PDF document text
    • https://fivetc.net/uploads/files/98276283136.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210724_CBAC06DCEF599579.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5e19d1bfb---mazuzunakeko.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/52157402788.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/23145243471.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210606_4E6FFBC240CB2445.pdfIn PDF document text
    • https://papiratisk.cz/soubory/pugobamusupawoteforizeruv.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085990627006---93267325939.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/worositalabufa.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/wekedikewoganugofigovuz.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1c4fbe49d8---81391940715.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/videvejajagafagijagit.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/78q6724i0b1kk1520r331nrm14/jadoga.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/55547195749.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/waxabufoligoxoka.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/sabivewonamuxozapise.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/1dg9uvet2ka3qf54pkc5i9mdi6/vikunowiguxu.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f7e3de585---49507231230.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/perifuvafotemubilix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=cisco+networking+academy+lab+manual+pdfPDF 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_off0000e44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5F 17556 bytes
SHA-256: baa1c3d9c898d67cbed0f74ff2a4f9eea34c532ad3895e2a879d2ef30855a95c
font_02_sfnt_off000129f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F5 11524 bytes
SHA-256: 82fcbd0624d85287039b1c7087d6ace6a083d28f4f3a19a35c29637c5f15dac0

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