Malicious PDF — malware analysis report

Static analysis result for SHA-256 f703f71c97cc0f06…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 00:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a721317656f5ff4f365fa13082f9b788 SHA-1: 65f760d7c61ccd986607c2562e4f3d6b580a949a SHA-256: f703f71c97cc0f06fa681e4ffd632a0310ccba75d36ed01ac1f02e498efaf8fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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 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://synerhu.ru/uplcv?utm_term=the+storyteller+walter+benjamin+pdf PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b19b46ca1---79597510170.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/finujukij.pdfIn PDF document text
    • http://yongqingtech.com/d/files/kesunuzikumiravojazekiv.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/e7ce356e4612c8d3226d8b941ecd06a1/koguboxe.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/34058705625.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/65593623671.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///jaluvituxoregomij.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/jukimigukagorimoz.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91330647184.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/45a8d35ecde3ef9db5952b9c93540b3b/kuxefosomenujat.pdfIn PDF document text
    • http://artepcb.com/upload/files/koxegadolosipaxema.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/dc35f94416daa701e1dcff373d68ef12/32605700144.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210911031245_104241.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d84d20087---3382439277.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/taruxulu.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/97963553842.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/31415922807.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/62072344030.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/lizikunokavigin.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210913_181835_115.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/guwikep.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/17119925147.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/balop.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/36341035666.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/tiwefa.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/10675997769.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/kefezedugekusokalin.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_off0000da2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2C 15956 bytes
SHA-256: 168c7d6dc21f5fb3f69fc53e2a8cd516f4f93b1879c5d3e574dcf46ea99ab2cc
font_01_sfnt_off000102e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF8 11196 bytes
SHA-256: 37e7dc32652387e9baf4735cfe6111e782f51741b9f5ac245a9c8f0c7001bdf3

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