Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b3c2b19f3648ae1…

MALICIOUS

PDF

68.0 KB Created: 2021-09-06 23:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5bbe4cb7118a2c385d8faa47a7446033 SHA-1: 529ef8a62a7125d45852947202f9eccde3f37744 SHA-256: 2b3c2b19f3648ae1a4888ae6d3d622e4af8d5b9ccc1cf6c110596767f40629d7
176 Risk Score

Malware Insights

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

The PDF document utilizes an image-based lure, typical of phishing attacks, to entice users into clicking a link. This link farm points to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 68 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://damiel.eu/userfiles/file/13299134716.pdf In PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a358f7e8410---feniborazokivimunam.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b403a5a2ea9---geviwufigikonojofad.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/03hs9mhmi7hiher09pc99crsnj/jorivizuga.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/wogovawaxugoz.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160e123f144990---44921826211.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134fa421a7a3---68289658632.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/kojax.pdfIn PDF document text
    • https://full-flavors.com/img/Data/file/norepudem.pdfIn PDF document text
    • https://monocroma.it/wp-content/plugins/super-forms/uploads/php/files/3fa3cdfab143d55358c94a8a12440507/58983672538.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/8u1vjacgoh1vrfmhr9dtgdcht7/26858423082.pdfIn PDF document text
    • https://anfauglir.com/images/file/51189305039.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/lutikazupu.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/57633147442.pdfIn PDF document text
    • http://whatdwellswithin.com/file/potab.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/sejakirovejudisibax.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/rogoxavajufuporuvi.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/tazagewapovazomi.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/xerobutivididavedulefin.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/vubezenode.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/zejigenalunetebogogisasa.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210606034207.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/motode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=protein+synthesis+and+amino+acid+worksheetPDF 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_off0000aed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED5 10884 bytes
SHA-256: 1832a7d36f8041b9577e2ab5732e7a7496a7c751a704585cdf5cf6af16d138a0
font_01_sfnt_off0000c7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E4 14296 bytes
SHA-256: b422bc4af4e6272395a2f8d5c2b4e72a3fd9b7f5b7da90c4f154101707af57f9
font_02_sfnt_off0000eaa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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