Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f70238cdff78d3…

MALICIOUS

PDF

125.3 KB Created: 2021-07-02 22:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b9b3227a89e0b20c754b070fa345d201 SHA-1: ff1470c420297dd8413121fb31d965f3d6ead24b SHA-256: 57f70238cdff78d3c2dbcaca6e62d92ea3518d26cc0d3040a6d9ceaefcd289d2
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple distinct hosts and the use of UTM parameters indicate an attempt to obscure the final destination and track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/4lnugj48al7o48tlhvh7n6s6l2/kegetara.pdf In PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/193cdf592bd717eb016c1c8962408cbc/wawerutitipojawufevopi.pdfIn PDF document text
    • https://lavaecucebrescia.it/file/69249694549.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607af137f0f32---67238765994.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/zajaxezod.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/mosikawejilesi.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608730432ccb2---95007274843.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d9459b90a---36677966968.pdfIn PDF document text
    • http://bethanybaptistcolumbus.org/clients/75549/File/47495584563.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/44342077414.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/d09d7f5ea7e6f0e0e9dad889e575f22b/60352070596.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082798add1c5---1057384340.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6195e8e3a8---jitotelob.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/ditobupenawelej.pdfIn PDF document text
    • http://coffee33.ru/archive/file/91551874233.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a557fd638be---wegovubukuramufit.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871ecbd272e---26097657494.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/lefuwibebaxewomo.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160944c218db0b---46004321494.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/eivn20vdjdpme3njhhjes7ao5s/sawage.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/dalusuzotosuv.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/fa41065a1bb1a5e8fcf513b5e54eeed8/39019798834.pdfIn PDF document text
    • http://pgnsualumni.com/clients/872691/File/19465425359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=words+their+way+elementary+spelling+inventory+feature+guidePDF 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_off000182ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182AE 11304 bytes
SHA-256: 6b381691b2a73bbf7959ca53cc91e326737daf4e8e7bf4008f5e0b866e263e6c
font_01_sfnt_off00019ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CE5 18304 bytes
SHA-256: 5083bf12e41f64b6036bd1f766abcb634718f9b6806e6ff6779f77b9974cfe03
font_02_sfnt_off0001ccdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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