Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a7c1cfd994254f…

MALICIOUS

PDF

102.8 KB Created: 2021-07-03 21:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1e75e3c30c3c787e400b2c2882ec1bda SHA-1: fbbe133076441ff9adc3d583bc6ab576db40d5a2 SHA-256: b1a7c1cfd994254f1a810edd593b1374db4802ff748f2c0726a4a204d0733a39
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4aef80ed55---73123581403.pdf In PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/71927901609.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/20715107775.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/betogabipamogajiweb.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/18042508235.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/34143369307.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/ea5570fd2994cdae67d2c0529984664b/93425879417.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726700de7d4---9932328269.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b595a6ba126---96628458149.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/punesowiniwikaxazudipete.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/73243469694.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/88216533322.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/dodimu.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160851fc3a7c2b---vizugimikoworokuzadel.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609def5f602ab---parul.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/95692126085.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160cd578fbc9bd---42242378418.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160785448bdb25---gapeke.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/49017795299.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/10353970996.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/fukajatuj.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080ac534a223---67610110607.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160815d289f514---77425194000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=wander+tamil+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014f86.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14F86 21404 bytes
SHA-256: e994cfc924f25a3134f8086ebde56d2c1d7548a2828e3ad87ab24f3f03db67e3
font_00_sfnt_off0000df18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF18 27428 bytes
SHA-256: 93b872e5f7a827bfa0f8e8de47244a96f857bcc22f848694e4f5629907e2f0fb
font_01_sfnt_off00012096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12096 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AD 10296 bytes
SHA-256: 14df5b4a03f2619ba26e48eb53a9a9adff93c66c33b7292cb49f50fddf97474c
font_04_sfnt_off00017779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17779 5620 bytes
SHA-256: 2fc6bd9fcc0b1525dd117bee3d6e6923f1217c0251b6c0d3c35c040805166464

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