Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc8e0f319f7138c…

MALICIOUS

PDF

103.5 KB Created: 2021-09-05 06:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0777f64eaad9cfbad889d39bf9a2ef6d SHA-1: 61ca0c2baea4cf0002a6e2df0d146a19475432e3 SHA-256: 6fc8e0f319f7138cc47869d64cbdb0e9823d3c2f5ac920be4c9af900e2a2da0c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it's a malformed PDF containing a link farm pointing to numerous external URLs, many hosted on disposable or compromised domains. The presence of external URIs and link farm indicators suggests the document's primary purpose is to redirect users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://archism.ru/uplcv?utm_term=deformidades+de+los+dedos+de+la+mano+pdf PDF link annotation
    • https://leuphuotcamap.com/uploads/image/files/87790450938.pdfIn PDF document text
    • http://wjcopy.com/upload/files/95378421589.pdfIn PDF document text
    • http://qdjshg.com/files/file/50307506511.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/68340403562.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/90791940553.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/1809241435.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/suzezasegijel.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/81236001914.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/vasokusape.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/6155105149.pdfIn PDF document text
    • http://www.toptehnik.si/images/vufamesikaselov.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/naloferukavuru.pdfIn PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/rurenasesif.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/72181365635.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096797c1994f---dokalizupo.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/20541754037.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/73104287922.pdfIn PDF document text
    • https://apronorte.org.br/ckfinder/userfiles/files/dutejikabopemagoxakapula.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/3a1acd838718c146032c2474b8d2cf74/60076423126.pdfIn PDF document text
    • http://packamate.com/userfiles/dekagepu.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/65574400959.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/fomojewinufiwodu.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af9dce95a5---82416951046.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/zidiworarum.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/galepelaguzo.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/q08mkmtg7amfg3aq5vn0hq5td9/53981852848.pdfIn PDF document text
    • 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_off00012aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000142b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B7 20288 bytes
SHA-256: fae396dfe34f63295974a960c8340e068b3bd19662d6923539362724778802e7
font_02_sfnt_off00017613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17613 10560 bytes
SHA-256: a2654f4e645dcd54d6ba7cf8efca901888bff1a0775e51e8a436105b51301ead

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