Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8b60cec056bce4…

MALICIOUS

PDF

86.3 KB Created: 2021-07-16 12:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 300033f8cb4b04040e987f5fb3e49571 SHA-1: 319b6a1bcf2db318d63658ed7ddcd6f00c3eab77 SHA-256: ab8b60cec056bce43e681cea5717d6e556c7ac1208e366771a0a1d9839104d67
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting domains. The primary purpose appears to be to host further malicious content or facilitate phishing by distributing links across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/0740759e92ace5d473d6370ecfe55132/70911452864.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/ae52513b29d598c2aeab56b9b8b5af34/49067460671.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdf6ece3f4---84149605530.pdf
    • http://skonasystems.com/userfiles/file/rexisonukuwasanelodawo.pdf
    • http://controldellaves.com/app/webroot/arxius/file/7224287625.pdf
    • http://augustaelectricalwork.com/editorData/file/xenaveradasixupid.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/aa8e1470a407ebf65176a5572d4f7b7f/77522181944.pdf
    • https://najlepsze-w-polsce.pl/uploads/63188715569.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714eb939714---52675583791.pdf
    • https://actor-conseil.com/files/file/vajilimetux.pdf
    • http://armanetti.com/images/netinokowakavenasaleki.pdf
    • http://noithattamphuong.com/upload/files/88419671699.pdf
    • https://ddshower.com/ckfinder/userfiles/files/zodus.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2255e0989---1534365495.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608313652d1f9---wamixefabukivavufa.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/cqd5iogkm7lksf5o3n0p8ont87/61039477665.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607877a328cb1---gexupijogovibotupumawe.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/66e3cjus1nve9u4lmmrvct2lqq/31474236695.pdf
    • https://sjalikave.hu/pictures/file/88237846957.pdf
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/72543541650.pdf
    • http://yangs-ns.com/ckfinder/userfiles/files/20210630044914.pdf
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/89490679510.pdf
    • https://cometsecurity.in/admin/userfiles/file/fasekoxizapasorimupisum.pdf
    • http://argol-editions.fr/userfiles/file/wojaxejefurojudiwafen.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/js61tn62coh5s9mni5tg2fkgau/53843127833.pdf
    • http://amuseonline.com/absite/userfiles/file/5204624668.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=convert+50+mm+to+cm
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E7 16792 bytes
font_01_sfnt_off0000eff9.bin
63eb9087dc200cb7dca0172dfcfbbdb2228111a83dacd55fd4fffea1f88afffe
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF9 17636 bytes
font_02_sfnt_off00011d4b.bin
386ee550310b4c004dbfd22ef0418c310b3f19d5cb81f137cb34da69aa9afd64
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4B 10276 bytes
font_03_sfnt_off0001347d.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1347D 16140 bytes