Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fff949a3e559d22…

MALICIOUS

PDF

93.7 KB Created: 2021-09-06 22:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dbff52ab34d12c5363c16b182ab6de88 SHA-1: 9dac7edcd5ef4833e39eb9b5df0cda086eb0d932 SHA-256: 6fff949a3e559d22ec3dc8f20336f01328a93d531058fc0c9e56aa09dd34f481
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, likely serving as a lure to download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing and trojan activity. While no scripts were directly extracted, the structure suggests a phishing campaign designed to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad225ee643f---59664800678.pdf In PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071238967fde---kudere.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5c42af3b8---kanukaganarujusiwuluxibo.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/69501988061.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-8-14/20210814052815315719.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d4d47330554aaf8d2225bf649438c570/10686838436.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/f137e95ca5357a79c418fc5d0021af0f/64890776641.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608861dd46aaa---metiwosajofov.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210624_0FBAB34F8B57C75F.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/wotewe.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e3989af20---44074590828.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078f61c5cd30---virakuvig.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160707b3f71370---tigaserefaverebiduzozogi.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/da3e6d56cc6ee64849e5b22e6c353752/57321698622.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/pividonuzevetojiv.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/38349085514.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2ddc339a7---sisanilepisunivuguletije.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/jubewidevukujora.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608309dba4540---85803613038.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e58f9e2efa---nitadirupebovutiso.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/87421019793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=logical+reasoning+questions+and+answers+in+tamil+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD929 11252 bytes
SHA-256: 111286b45f73e1f72e46dffef6c2efa475dca1e0499b7a69eb1e7ea9d12620ce
font_01_sfnt_off0000f30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_02_sfnt_off0000fb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB93 16400 bytes
SHA-256: 37a374b498d47261baf25b300a36b4316b067f86ea129d4fad3516ec8349488e
font_03_sfnt_off00011236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11236 24888 bytes
SHA-256: 93a33d3ab6714da11401ea21b1451cf5f368b4e709f3ed5589d97a1fb5ffba06
font_04_sfnt_off00014ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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