Malicious PDF — malware analysis report

Static analysis result for SHA-256 3134f63a6ab34a26…

MALICIOUS

PDF

76.4 KB Created: 2021-09-01 02:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cebe649b1b6c07e799ea208decb40560 SHA-1: 0f3429c584e41e161fa096aaf9654508978eff48 SHA-256: 3134f63a6ab34a26bd2ae80e08ba2ecfb374b3433aba2b668ec3a2d81de770f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often leverage embedded JavaScript for redirection or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081117472cd0---xipemelovur.pdf In PDF document text
    • https://rireenfrance.com/images/upload/files/raditiremelebawegusewe.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/95777661262.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/darelawuwonula.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609572c319f1c---37349665058.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/0960ee3ecfec0ca28fcb313b49e2bab9/42211815157.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/pegosesijifi.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/gorunu.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/49441563855.pdfIn PDF document text
    • https://12shio4.com/contents//files/36581331917.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/073175027f9d8e11b8d9de7886079198/tenisuvorilirejipovi.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075cbfc17752---23832597925.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/91637169912.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog//file/10995645450.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/158c28a4a80ada7afa6fca7bbd1be3b4/15041946552.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/69431794646.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/kowudamunir.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/44220510747.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855f2e17d0e---betisapedat.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/8db51ff5d7660532591adfb75a3b0a84/fugolulosopapanelu.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/15rr44echedp1rqj4qrgb6ciqk/16137619315.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6401ff0bd3---mofupixogudepuduwoxumupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+a+great+great+unclePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBF 17612 bytes
SHA-256: ef7a51180cfd07c30e300be2d894601dfc8b6bcc716a8cefcebfed09775015da
font_01_sfnt_off0000dc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6D 16220 bytes
SHA-256: 27be6dad13d8a6341d10947f3f98b0df1170d7caa749147ed953695dcdaaaed9
font_02_sfnt_off0000f249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF249 10480 bytes
SHA-256: 23262b9f2318e0f0a14844667dcdb66847ee0c034f1fa3e0ad98182dad70eb9d
font_03_sfnt_off00010a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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