Malicious PDF — malware analysis report

Static analysis result for SHA-256 d709cda3857ac622…

MALICIOUS

PDF

84.3 KB Created: 2021-06-25 22:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a284578ae0296f4974519900353d60e5 SHA-1: 40740a5c87d1914c8efedead59bbe707268bd162 SHA-256: d709cda3857ac6223aad8f731dffdadd985a4729dc0f7e5c8dad1522332f8414
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm nature imply an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://alkanboya.com/files/file///zejir.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7cd0a4d37---69230821478.pdf
    • http://cl-metalparts.com/d/files/jorisozekuwamujegitawowa.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a5878ca580e---pesisonobipoju.pdf
    • http://ddrwc.net/clients/869849/File/sigon.pdf
    • http://controldellaves.com/app/webroot/arxius/file/83770730175.pdf
    • http://amexeuro.com/an3_Uploads/file/17191047370.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/9hnnosumu39sj22c8bnghr8h0g/91995377312.pdf
    • https://denizlihorozu.com/resimler/files/49831277734.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d215b7d1b7b076bf308fe38e3b8eb93/22912688280.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2443307d26cf55c4577aaa1a265b4a24/puwudisugowozafosusesozod.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098430982c47---mexunalamewipuguv.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/116f6f7fb99d0f4f1e3c31d03720afa4/kajajo.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/de6395ffbaef5614c324f46ee5e49040/41979464104.pdf
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/97146259343.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ba55c2a84---44353333808.pdf
    • http://pijntherapie.be/uploads/files/72634739075.pdf
    • http://anthonyvienna.com/sites/default/files/file/medowigikilitiwoxomexi.pdf
    • http://robertfeinberglaw.com/images/edit_images/file/91564879163.pdf
    • https://brahmagnanam.org/fck_uploads/file/95464009206.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807338c9c5c---xinowudugogaso.pdf
    • http://elitaliaweb.it/upload/file/7832833063.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/310075988450b45cdb47dfd1d6b7268a/59772158254.pdf
    • http://axwelindia.com/uploads/folufuduferurula.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3465be3f---wozenugejoseruxikite.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=jersey+city+slip+and+fall+attorneys
    • 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_off0000e673.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE673 16792 bytes
font_01_sfnt_off0000fe8a.bin
a87f3be87997147e6955371d04879b57ae6d0c1fcf8715b876195637841b324a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8A 10716 bytes
font_02_sfnt_off0001174e.bin
af0100dab32ccb029195f95ed67d907fc1a499a0691a1254f1e6ada3174d8191
pdf-font-stream PDF embedded font (sfnt) at offset 0x1174E 16556 bytes