Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c502afd2d1bb5e…

MALICIOUS

PDF

77.8 KB Created: 2021-09-02 07:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9d7f29dc31c46df3094cd4b026d4d28e SHA-1: 3eda28fc240dab38e20be5ef2b7862b3b930c160 SHA-256: 28c502afd2d1bb5e4018c27c54d06a3e19858b90f6ebebe4dbc2a6541374d35b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160900d7a8312f---towejufuz.pdf In PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/0isg3edq8tnv09q3e7s7iksh27/sifolalunoxobuliresemuf.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/45043582323.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6422d9e307---11454568577.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/78661295432.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/78175532428.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pv4537fmvh3vh8t8t4u33a0o06/tapasebowiwajidukokenexe.pdfIn PDF document text
    • http://nakatka.com/files/file/16301471978.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/63654629437.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/nutetunep.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/24010038724.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/06ra61n87fve9dgb5bs29u77up/lufepijupelunenaz.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/jogusiresibuzesorusumuges.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/78086798110.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90a9b80eeb---91692784215.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f7c66e6db---1496886808.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/sukiguruxolab.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a663b667c6d---tubonevur.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610110c77b44d---zovaburufanok.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/6pr5f052040go4loncmge8obnc/xosafabajiz.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/9898906115.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/4ad217a23cfdc859be99b86850ed37f4/51901873822.pdfIn PDF document text
    • http://tms-operation.com/upload/files/tezegotolubebuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+harsh+cry+of+the+heron+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_off0000ca18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22A 18676 bytes
SHA-256: 77ac5cba6bb63bf32467d947eb1bbf3e999e2a5a67e5a30c552938c7f840a49f
font_02_sfnt_off000110f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F9 10656 bytes
SHA-256: 508bd3129b8c0738d7c21c6ce28a4af267634d49b6c805d51d4245cc25f17ae7

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