Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb6b8dfdc41a4a4…

MALICIOUS

PDF

77.2 KB Created: 2021-09-07 14:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 52322202de66ee4063cf1b22c0b50258 SHA-1: 1dc75dba33231e435207fef2a03f55fe4dbcd0c5 SHA-256: 8cb6b8dfdc41a4a474c0cb4f61f849192daea1534c2c9a8a7536bfd8e147cf5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The primary attack pattern observed is the use of a link farm to distribute malware or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cuacuondaiphuc.com/upload/files/kinedepupipikobujup.pdf In PDF document text
    • http://riccaassociati.eu/userfiles/files/89372779299.pdfIn PDF document text
    • https://samowar.me/upload/file/tetixoketapupewi.pdfIn PDF document text
    • http://htcable.cn/d/files/tenulewigizedudixo.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/dojisarujamakazorew.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210731_6B1CB947D53AD160.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/fuzavegijunovinitabana.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5cb19d322---regufenosasodoverotidaw.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/fitura.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/1742482800.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4df4cfnra3g81gso6hg78alag2/41684462579.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/xaxupenudik.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/68399922974.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/52070981828.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160800bc069ede---19268118516.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/spp96uofqs7a7b2hrmbvsj6vnr/92611348291.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/pivop.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/ed38a586f9b6b23084f00047beaab343/wogerorejotivumibikinag.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/82403427162.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/jotoravuninorovovigoruwik.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841515c47e9---dajozi.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/0a20c2e80318eece63e6d2be0aad1155/dadepizev.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/23916927012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=antioxidant+activity+of+apple+peels+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_off0000c5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE3 10776 bytes
SHA-256: cf2d4f517104a0fc772a214163d057501b9746d95a54a72616c19d68e7cbfe1f
font_02_sfnt_off0000f6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EA 18652 bytes
SHA-256: 2772eac62d9dcdd76969beefbb24a5466b423a3f4fa41eaf485f7f2d784630bb

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