Malicious PDF — malware analysis report

Static analysis result for SHA-256 db243eee8652bf66…

MALICIOUS

PDF

96.7 KB Created: 2021-08-03 20:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3f8a57ae88c0346f09713eac11b563cf SHA-1: cd42ca4caebca87365ae9fead85ea0dd8c4e8033 SHA-256: db243eee8652bf6684e18110d8aa99fbd06a6137973e63dece6303e89deb2a58
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of a link farm heuristic and the nature of the URLs point towards an attempt to manipulate search engine results or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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 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://bringem.de/wp-content/plugins/super-forms/uploads/php/files/53190aaa13ed28effd3819178ebfafb8/tafaguferubumizesanexegu.pdf In PDF document text
    • https://pfollowers.com/ci/userfiles/files/22401323997.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/76500868665.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c3f7555f8---lakewali.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/22725872038.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/petegemekin.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021060608562849.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/5992716891.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/pirema.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/366177158.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/debuz.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/nupofalidozezojeg.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4116e80e0---38871411993.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/xukuzakopenejoxakebidugov.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/56024433726.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/g07l23dj1j7khs8ef29lbcg6jc/zegulinaleragatalimuxer.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/b475ead1f49c657e2fff28c3cc223c89/rolovirukapakupaw.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/81c3e340d9efa656e28acb48bc64813d/konasawu.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/mluf4fv7p14109vi7tb4p5vqh5/gomodisibarosak.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/90770405931.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/70065808699.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d30bcf79a60---wituzivav.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/bedijogis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=what+is+the+best+french+door+refrigerator+for+2020PDF 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_off00011570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11570 11084 bytes
SHA-256: 776b9c056b8a62bdedeca3c832c5e5d01048d2cd5333425241f3cf7c265f4b8d
font_01_sfnt_off00012f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F15 17544 bytes
SHA-256: fd361db29c8b7389634dd75edd68b98e19f54aeb47eb26d1b25256c2795ba382
font_02_sfnt_off00015c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1