Malicious PDF — malware analysis report

Static analysis result for SHA-256 7904d56d504f6b6f…

MALICIOUS

PDF

93.0 KB Created: 2021-08-20 15:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: a7b3288060f9e9bb5fa39727ff1026ac SHA-1: 0a25ea096101d9c179c90520aa3a18fa407c15d0 SHA-256: 7904d56d504f6b6ff718be54b2408b22a25e10948dd93fa5cc0910b1d2fb8ae0
184 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kielcenoca.pl/files/file/tubuxupivubojuzujogas.pdf In PDF document text
    • https://sjalikave.hu/pictures/file/91971950921.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/39409824768.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/63242494571.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/marozakef.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ff3440b5123---97061573628.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/32549484420.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/tutikivusu.pdfPDF link annotation
    • http://macautemple.com/userfiles/file/29683091128.pdfIn PDF document text
    • http://hongdacable.com/d/files/13112725551.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/fumaxeratexupuxizado.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/rgrfnhk4uisa65ht6bjv823gc0/zomapirawopilobebolofixif.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/32071922554.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/pokegerafulesitezebaxosa.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/wixadezonabage.pdfIn PDF document text
    • http://atek-ent.com/upload/file/26511731350.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85fd4813a---84946197636.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6401392c5---22005735821.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/82659929920.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/vazatanofaveset.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ed87c79416a---95995441231.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b9947a048f7---97495721679.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/747540092a4228bfd9dcae660e63c70b/86431157024.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/rgn7s0vgnsad0vkqkq6e9vqc3n/sofufasagigepaz.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b219cec95b---66230259960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+hack+asphalt+8+airborne+pc+without+cheat+enginePDF 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_off00010019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10019 11268 bytes
SHA-256: 9fe17c174a70797ef385dedefa1f4c2fcca5feb21c65270e61b62cf93e0ecec1
font_01_sfnt_off00011a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13273 18676 bytes
SHA-256: c7d5037c29cb375792d98ebdb8ec50d980eeccc3da1860710a458cbfbf3db896