Malicious PDF — malware analysis report

Static analysis result for SHA-256 87fb8f49cc91cb22…

MALICIOUS

PDF

84.7 KB Created: 2021-09-09 15:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 375aa3afe0e236189747731a16db08c8 SHA-1: 3374c349cf6658c9c4e9e5a5a395c97523dfff9c SHA-256: 87fb8f49cc91cb22445f5163c2139a606af96a01c68d2651782f6b5596c47191
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a link farm pointing to various domains, some of which are hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of a QR code lure further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://djarkitek.com/temp/vinney/HTML/userfiles/file/vorokadilumifo.pdf In PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://debnine.net/UserFiles/File/49160794880.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/93010873445.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/27805766617.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/lisixad.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/55067679113.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/vifixife.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/pivezuzafolisir.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/9440124236.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/jijirukivuduwerexobimim.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/rarunomapofapuxozatumuf.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/pupibinipixituvov.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/95121032316.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/bixoxato.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/14487386670.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/95090465736.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16134bca7ae87c---47697785941.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/5c14aa5b9cd2afd924d414122537a66f/79599924218.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/32228721114.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/f02db029112ac573fe203574d0748320/xovukofometup.pdfIn PDF document text
    • https://rails-bg.com/fckeditorfiles/file/xuxip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=among+us+1+androidPDF 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_off0000e70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70F 18608 bytes
SHA-256: cdf5cff7791517f94a7814a9baf16437b8b59c573fd772c926196c867c675d74
font_01_sfnt_off0001166a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E81 10448 bytes
SHA-256: 7ea520224dd8d431899526359062dc3aead5679fbef6c069cb9d22020040ff2a

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