Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f31829acf0de00…

MALICIOUS

PDF

103.8 KB Created: 2021-07-20 03:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7fe2d6c1cdaf5bed3c0202d38a9f3a14 SHA-1: 9ab569ccd5be6767e26a4e6ea001e73300a326a7 SHA-256: c6f31829acf0de00d9712619738fe7790e4070b420f6bf542724b1d8952d44bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites that host other PDF files. These linked PDFs are likely part of a phishing or malware distribution chain, aiming to exploit users who click on the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/11ba59af4d43798e026558f109d402b3/44670575503.pdf In PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/99abaeccb1ff93312ee5d225e90f6c83/41805707402.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/au5ovp3r0vlq8d6l59o9qj86qo/31326676685.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/gurifu.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a5851321f---13102842197.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210720043850.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/wixusutekixusukedajisot.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/7704c9c26d249d17d14bc55b3f45f7d5/famazov.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/renarexogopekaginonovetud.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210607200908_fvs6so.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/1342648443.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/pezonujawefasilubap.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/aba4c6c4f49d401b9b23ee2fd6433703/2946495283.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc31003341a---gerugatalibulelo.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/f14b76410b8698117f27325766295eb5/parabanajunolegibuxoxi.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/94187172740.pdfIn PDF document text
    • https://maturana.cl/upload/file/92120929677.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/cbebhfvbnk8qt10neagl29r525/lomalepimiwuwagedamubuwos.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/0fc52b961294dfeac1524a2243b1597e/xotupelijoja.pdfIn PDF document text
    • http://hasyo.net/files/file/mugin.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/85224940247.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/89e5b07cdf5196a778f5823dc2b04697/64587360701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=fill+in+the+blanks+on+motion+class+9PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001331c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B33 10772 bytes
SHA-256: eb7f0d88527af22f81264a744d00d1a7cbbfc1f2027591287341af95ca82e00d
font_02_sfnt_off000163c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163C9 17576 bytes
SHA-256: cc64cedca5c26fef58a1fd4a9b12b1da10ceb15743cfaeba568a1e76a24a3ea6

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