Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c573643f8610dfe…

MALICIOUS

PDF

86.5 KB Created: 2021-07-03 11:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebc1994f3f10a2da40935af0656b80cf SHA-1: 7c0df43886b286750339acecaf23b12069e52fb1 SHA-256: 3c573643f8610dfe23aab1281fa500b113020c38a043a2b8af8ae0b1faa19e7d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download' button lure further supports a phishing or malware distribution attempt. ClamAV detection confirms the malicious nature of the file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • 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 https://nomylo.ru/uplcv?utm_term=i+am+number+four+movie+download
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160825404353a0---figulimesawetojub.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/gebupinupote.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4bp54cq11h9pq99l5bc96vormc/welebegogonixadik.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16079b92c8b120---72337399636.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607086ebbc799---99514199125.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a03dc3af944---kejefupiponazipowamid.pdf
    • http://allg-gyn.ch/userfiles/file/mopuruninumub.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff78071c48---18609935911.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608c68e7748e9---31397271188.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fc77e4cbe---73213971471.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/aaf343d0282d64071d8cfa715d162dd0/56656536544.pdf
    • http://sportschoolindex.nl/images/uploads/kaxakupoxovasuveveninu.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9658460107eaf6172fb8a1b039d3aee4/43175096092.pdf
    • http://al-bandak.com/userfiles/file/91089140113.pdf
    • http://k1a.ru/images/files/file/1055805626.pdf
    • https://alshaabcoop.com/userfiles/file/46643505067.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/fd44a2bc41aefbb18d6fa4628406d282/14609259114.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160980f49f1fbf---botelofepugubagapa.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8702d4566---delelamazijokufav.pdf
    • http://t-p-fortune.com/userfiles/file/vefiwitekifoj.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f3caac3f0---sukazeros.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15ab2aea76---81652107404.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_off0000f0e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E3 16792 bytes
font_01_sfnt_off000108f5.bin
a7cc8f3562022cf625ffa71c6e3b8c505841608c088cd78ab5fb6e3897fdd493
pdf-font-stream PDF embedded font (sfnt) at offset 0x108F5 16960 bytes
font_02_sfnt_off000134f0.bin
de313d98c9f5f80875454f0acae4023a4aa70666128080388f18ce1df9bff687
pdf-font-stream PDF embedded font (sfnt) at offset 0x134F0 10592 bytes