Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0d315f5ad17597…

MALICIOUS

PDF

96.7 KB Created: 2021-07-19 14:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d6af1504fab76fee62c2df89fb347b51 SHA-1: a034996e2b1f0a09a84cf951576a73099209dd81 SHA-256: 3b0d315f5ad175977dc01f802266277efde90e1f0f292ebe22089b1aaa9d7bcf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to a compromised WordPress site, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b85fd7839---75731801127.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/563c2f0db9af18cb609ba5314a99d8f0/vasilijuxelekires.pdf
    • https://rzfmuhasebe.com/userfiles/file/51570179022.pdf
    • https://chulintemple.org/CKEdit/upload/files/95208661784.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55297d6966---1847353741.pdf
    • https://alutat.com/data/file/koxefe.pdf
    • https://alternativecarrepair.com/userfiles/file/11209944663.pdf
    • https://m-isc.com/userfiles/file/9738682234.pdf
    • http://frickcontrols.com/uploads/files/fubaku.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7ff1c8c0f---jidapalajileduvitebul.pdf
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/vumijexoperokaf.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/3f152cd3062d6dc588c67b00c81a5540/94345125121.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3766970d72---buwofabudorinito.pdf
    • http://hoteldarim.ir/basefile/hoteldarimir/files/wifefijuz.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/229065a35dfdf0b7de6820c005bee2c1/woxuxavoxa.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16088f34e7166e---81854507425.pdf
    • http://citranco.com/users/files/56466250190.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ja0rbqjmc2r08k85nbbsfj5ro2/juralumomolesajegowe.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3b388af45---jedifisubofurasik.pdf
    • http://csc020.com/userfiles/file/20210624004629_ek8ntg.pdf
    • http://bukvoznaika.ru/ckfinder/userfiles/files/nudazozodigasaxewobepev.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160809c2fa7b29---dutudixepaxes.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/930cf3a8a385f5b117b69a81a4dd9295/53914332147.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+market+research+toolbox+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_off0001187e.bin
82e917c14338548ab3fc0e120d54ea9c95b9f25deece6c66338a35196685d3ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x1187E 16808 bytes
font_01_sfnt_off00014449.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14449 16792 bytes
font_02_sfnt_off00015c60.bin
bef25285c5880766ee2129d4a481505fda27561a9dc01bfe30260aa424085a2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C60 10984 bytes