Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a3e33aa8e1e1d2…

MALICIOUS

PDF

83.7 KB Created: 2021-07-13 06:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7dfd5c02890b1bf01bb6fa57277d0aec SHA-1: 49c20a15ff0d9d79f7dba4383630d5830047d63c SHA-256: 91a3e33aa8e1e1d25936ccf4e503fae139afc00a133370206c4eee25149ce6e8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs that point to compromised websites or disposable hosting. The presence of these links suggests an intent to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=iste+2020+conference
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae1ae87f4f---mifaxun.pdf
    • https://burlingame.com/wysiwygfiles/file/ritefiboxokewotudi.pdf
    • http://thessalonikiflights.com/files/files/55631486424.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a41515343fa---kifipuvuli.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/a3k7ca53m39tmhhfshq9eoh71u/tagowegovotibi.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/edblh7634dn730l3gde09ck2ss/40716888301.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160911a397c2e8---berefedavojuk.pdf
    • http://spamsmsgiare.com/media/ftp/file/46305645694.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/19bc4ba606d3fb1c966da033ef6f327b/18794063456.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2ce4d14e8---bukomodid.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/0iribm8fdpo3ch7a02lnq3rh54/49752635880.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814bd2f12a0---58907498060.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/265edcd62c04a6a0d806c50c4581b36b/17187404006.pdf
    • http://wmehoa.org/clients/d/df/dff1b85474dadb967ea0c40f6d5e37f8/File/29608050892.pdf
    • http://rauvuonsach.net/images/uploads/files/gosogojixutojugigovetim.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071eab1edcdc---kunudatasuxetofalewulefu.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef02ae1299---49471816302.pdf
    • https://stancijanegrin.com/UserFiles/files/88512893687.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/624414d63c812b805b01795ea6d40211/68716962493.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/sp47ppilttc0p1q6ojj38uosma/mekurogejuwam.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/eofo51iai298sb97h3hg68r2s2/vajesote.pdf
    • https://agatanorek.com/files/file/kegizezemubisuditeva.pdf
    • http://better-pharma.com/images/file/files/37922025550.pdf
    • 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_off0000e59b.bin
a3ae3735b11550ab189cf926d5514380b068adbf56f9dbf8a5b6704c8f7e1e3b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE59B 17092 bytes
font_01_sfnt_off0001128c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1128C 16792 bytes
font_02_sfnt_off00012aa3.bin
f05fe7db1f408b48d6eabfef77c4e9e967842df2e76432a937d1eafcb2e23a29
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA3 10220 bytes