Malicious PDF — malware analysis report

Static analysis result for SHA-256 d762e856b5ced81a…

MALICIOUS

PDF

95.0 KB Created: 2021-08-09 09:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 263c2bd712af90df9d16d10634b58e15 SHA-1: 6502d5c4bb9a385515f444e268ac7f30a53d2c01 SHA-256: d762e856b5ced81ab45a25cfe1e22b9a41fbbc6337f4c0eef5c03a6a632c666c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick the user into making a phone call, typical of phishing or tech-support scams. Although no scripts were directly extracted, the presence of numerous external links, some pointing to compromised CMS uploads and disposable hosting, suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://tw-sincere.com/upfiles/editor/files/zagodisewapiseladuviwi.pdf
    • https://kermoulin.com/userfiles/file/manalivowafes.pdf
    • http://duetsepolno.pl/userfiles/file/nopovitupujosavalo.pdf
    • http://lnimeina.it/userfiles/files/natamanafijefegolave.pdf
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/83749088796.pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021521043291065.pdf
    • http://kahasat.cz/data/file/xolifopagofavevutelida.pdf
    • http://escritacontabilidade.net/fotos/news/file/muxidezaneresuvadof.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a468d88c97b---17537885502.pdf
    • https://digicpictures.com/downloads/ramarizamus.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e633c4b8e2---jodiwefosaz.pdf
    • http://le-bouquet.be/userfiles/files/xeposisupukogugab.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/ea83d390dd2ccc00ccc54315d693409c/sunokifajegevatupipo.pdf
    • http://khamtribacninh.com/images/files/72622044661.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a9aa6b5a3---lezutigexur.pdf
    • http://kaupa.cz/userfiles/file/kadimutanoju.pdf
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/dunibeduwarifusazawoxe.pdf
    • http://bomtvplus.com/data/board/file/20210520195724.pdf
    • http://offerseir.com/basefile/offerseircom/files/51169607854.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/92m2clehsbaeqgbt5s1ptthhsd/bijan.pdf
    • https://securitydm.com/slicice/file/nipedenu.pdf
    • https://floridainvestment.cz/files/file/68777500431.pdf
    • http://lab4050.com/upload/editor/file/dopiriz.pdf
    • http://www.moyekolodin.com/files/79034831319.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=is+genie+model+2028+compatible+with+myq
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107bf.bin
faea4642fedf6b8d29db67feafa0cadb0da4a069fa389fe92192cbb43b7d01f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x107BF 11748 bytes
font_01_sfnt_off000122f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122F8 16792 bytes
font_02_sfnt_off00013b0a.bin
f37916b1ec50d4de964de92d4db7b5efc076a725cbad481c05e57380fecec7f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0A 18148 bytes