Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7ee34196ab08e0…

MALICIOUS

PDF

90.3 KB Created: 2021-07-28 02:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 87e8d0c6e33584c7eee1d5733039d75c SHA-1: 31089114f4d9be27d206d1bdf619effee9bc815a SHA-256: 9b7ee34196ab08e0ca9a64fcf02ae8bf4f59b7c1954dcb9f1b05049c540c9c9f
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV. Static analysis reveals it functions as a link farm, with numerous URLs pointing to external sites, many hosted on compromised WordPress installations. The presence of 'utm_term' parameters and links to disposable hosting suggests an attempt to manipulate search engine rankings or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://zweefvlieg.net/userfiles/file/67863880018.pdf In PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160829f5286c4d---zufida.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/3a36b5cc3c04b3e56c18ce8ddbbecd3c/zukosidusebuj.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4eb75244---70606223277.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/43007222154.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/40714511294.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/kififuwikakuxuvuz.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa04de6f932---vavulebajubijebuzime.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/f52f1de56fe4ad80359b484caddbfbbd/kesar.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/83908997124.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b79b5fd4b---wadepapifesozuguda.pdfIn PDF document text
    • https://capecoralliving.com/media/file/33213043633.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/64030857718.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/78090058078.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/rogusuzoruma.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/datipigedolarev.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/4dcj9f65i5eorlfcv2k4tpfd6n/vofusava.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607870c0b95f0---4462112423.pdfIn PDF document text
    • https://mimpishiosatu.com/contents//files/sojagejenebigafavemusi.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/guvigeketidubofusovapusuw.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/d236a76beb076e7d19775bae55992050/nunitapezebizomenesuti.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/nasedisu.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/61996293085.pdfIn PDF document text
    • https://dietmoitangoc68.com/upload/files/bejupukojasalerepebadize.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/bitamefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=what+is+a+hold+harmless+agreementPDF 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_off0000ff82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF82 16812 bytes
SHA-256: 1a126804a7473ccd8b5e93b3e7d7a3cc937c4d3e6387872bfff2bc5cfbefaf02
font_01_sfnt_off00012b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14374 10688 bytes
SHA-256: 71cc8a11e6070e71e759088694007d592fd47eb3ab28eb3600d333dc9b368444

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