Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7d7f3d7a9096c5…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 20:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 90b15f15ea056c2c20e4baa8d44394e9 SHA-1: 35793f54e1106f58da2a1b34aa2bffe4d13d8289 SHA-256: fb7d7f3d7a9096c54a8343586f333a3971648157f395abb521505363ea6c175a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://philabc.ru/uplcv?utm_term=cara+buka+file+pdf+di+hp+android PDF link annotation
    • http://autoneza.cz/UserFiles/File/tezarinope.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/jovipivilejexitijabaniso.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/somovuxunolasabolep.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16137a70168e12---kikorudosogiwenubakejo.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b75baaf47c---7769723387.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d60f7199db---82045797951.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4c1fdcead---69606220106.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/91086556657.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109121951102931.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/52598189728.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/64633844590.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210918062026.pdfIn PDF document text
    • https://affze.com/userfiles/file/40505613048.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/jajifilubol.pdfIn PDF document text
    • http://akademibt.com/resimler/files/zugiluguzojope.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/xanutixuvolopigogulevopiw.pdfIn PDF document text
    • https://telorgabus.com/contents/files/xegogugejerizizetiwavuzi.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/53290462555.pdfIn PDF document text
    • http://battle.bpv.su/content/files/files/35916741510.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/78861810472.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/64199000550.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/6280860281.pdfIn PDF document text
    • 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_off0000af47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF47 10692 bytes
SHA-256: a816d849066380ed837babe264896047c6e6a886d3456342dcff0a65ae310697
font_01_sfnt_off0000c76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76E 17328 bytes
SHA-256: e5dacf9177fe1888d99439bbed7a583212a6fd34ae15462e9e37f5f2f716e31d
font_02_sfnt_off0000f335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1