Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cbd6cc4947bef8e…

MALICIOUS

PDF

90.1 KB Created: 2021-09-05 12:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d4655bd0e4ef1a1b39fa31870fde9e98 SHA-1: 44bc53c25388bf4d230dd4f0b2af28aa76f9decc SHA-256: 9cbd6cc4947bef8ea2e09b742dc1e053dccdb3f95cf5349aef2354dcf436ad4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The 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 numerous PDF files hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://wang023spa.com/userfiles/202106file/2021062416512770554.pdf In PDF document text
    • http://abwpetersburg.com/uploads/files/fawujupepemakis.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/74231392439.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/31706969886.pdfIn PDF document text
    • https://cubic.is/userfiles/file/4036273341.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/vilaturowufobufamas.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/talubuparadev.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/d9vb34a6hokk7mrnv77e99jg4h/fupixupikugajobaziwoj.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075098c96e36---pagexereguni.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/94624185347.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/d508a655a8ddb251731c71b5c9fbcf24/lerurakuxevevosusamaweb.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/0d69ea90d85261539e1210ccd1ae1b11.pdfIn PDF document text
    • http://phanbonvbm.com/upload/files/76036476362.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c720f8ba04e---62503739288.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/xefitibuwexew.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/97fb61dbfdbc247cfa835bcf7640b227/2314419026.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/tened.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/c5ebe84e99f656d7a2c8c248f9411861/razorurexaniko.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/rexulozikipuvijavovetoro.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/6dbaqc7goma59iatckaaia4537/38112520025.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/46ghtrvv1pvlmqqenbf3bpgoks/75055374430.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/25292290687.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/bc80ad33ebc2c86155e8847ad786cd0b/94572252932.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afccbdd503f---nuxefezemidijagafegikidos.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/f0ae811b339222da7dfae354a467476d/tizezoxodewi.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/mep8s263ugq3n46isvnhdgboqd/bulivedilijibuwasoxowupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=palm+oil+mill+process+pdfPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FD 10580 bytes
SHA-256: 2bf2fa32a1b4ef653968b5cca5474c97ff42c2ce734ebeabc935fdccac5bcc1d
font_02_sfnt_off00012d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D10 17700 bytes
SHA-256: a3813faca2eae84d886b16be2e11065a2be53311cdf599f548d4907f155aac10

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