Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf2af1cf0727af0…

MALICIOUS

PDF

87.3 KB Created: 2021-06-23 19:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 23d2027439a00922f289d28bfc13b9e3 SHA-1: febe1d2f95708b81d2d3397b85ed1b051201cc38 SHA-256: 9cf2af1cf0727af032ad1c4bff34238bf84955ea5f7ad3eaab4984bdebe01c1d
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://queure.ru/uplcv?utm_term=warriyo+mortals+ncs+mp3+download PDF link annotation
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098a9018ec73---netodoxosijevem.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608843ac725cb---pufifabumotewa.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5bee64f3f---raduwedejotule.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160793a97d7056---34131794765.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/7ec2eb26aebf48c0592ba45d48243551/faxipepimidaruveta.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e0daea396---pekapimorobonilawoperevim.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/0bfda98f79975bbaad41debd296e3a40/tubedosevopojemelajuzeni.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/41fc003c186a9cce994287e5f5f95303/42425036089.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/08543eba023c52a33153f8fa1701140c/soribiwefud.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/9241300bbdee415df0c89bdd4e441d49/4963346650.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/93582271066.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/gigorijebap.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094c6bebaa44---tomevutedafajanavizev.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/8qp4qhargsitb094pe3kj90at1/79784627312.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/fcccbaa1aac80e2f79f4bdfc18c2c1ab/lutudixufekezurejazul.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8789e1aff---67067413523.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/cb055fa1326d3fe74dd6002c7a7c8d2f/nezilen.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160ae511a97241---zegorijidozam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA04 3032 bytes
SHA-256: 310a7b91015135606049b9621e47720fc13f2a9e1fb321a37d7a7f0fde0b9329
font_01_sfnt_off0000d4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D2 5588 bytes
SHA-256: 23675f831b46d7864cd9ac71e9bff66fe01befb8b2d98605c2852ae3e09c4fa6
font_02_sfnt_off0000e7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D8 7388 bytes
SHA-256: 7f40c97f7a85d0ba04b73fadb166f45b5f3ec3b38ccca70b0d24ef3d913931f4
font_03_sfnt_off000101e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E0 11752 bytes
SHA-256: 28cecfa6b6f89132d3eba5622697864337da8d6a8850cffc40da57071d67a014
font_04_sfnt_off000129ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EC 20732 bytes
SHA-256: 873a31ab6f70ed013e92d4edb98c40e822d67d09d94ef33fa25b72252990ca1e

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