Malicious PDF — malware analysis report

Static analysis result for SHA-256 535d84bbb263db5c…

MALICIOUS

PDF

95.3 KB Created: 2021-09-02 17:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 136292942941bd2cc028b843c0880fb1 SHA-1: f864bcc2a3e93f647f956af41fd7f42f9540f23b SHA-256: 535d84bbb263db5cc89cfe26b2feae3b0330199005f1aefa5916cf43f8f7da8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://huntic.ru/uplcv?utm_term=verifone+vx680+3g+manual PDF link annotation
    • http://dogoxuavanay.vn/uploads/files/xomumamonit.pdfIn PDF document text
    • http://isgsrl.it/images/file/bajewuzazajobege.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/97107599982.pdfIn PDF document text
    • http://surausa.com/uploads/files/vedifobujixawuru.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/8692080036.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/ab3c857de7a546b3969dfe16cb49c222/ledoxoxujukejuvizejaj.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/vsg0tkd142dh3lnrrel4kk89l8/sivavisuvejudexebazu.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b16de3fb88---litufokel.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/30244130a7501bc0ddb2fb34d7f219cf/79327115739.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b59eb049ff---lidawaladoteda.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/rigojameruvofuvate.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/5da220ada8fc1634617078ec94128b1b/9179501151.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/dapokegajuso.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/60558808369.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbaf3053ca---gibiguzibekutad.pdfIn PDF document text
    • http://prosquash.by/data/zagagawagiwizisatuzedeg.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851ea68979c---migupugi.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/zanazowi.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/botip.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/fuwulisokob.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/15401535382.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/4e78201336fcd0a7359cf898ca803b6a/93650208846.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/50192091530.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/toxesajopisusutog.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_off00010885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10885 11200 bytes
SHA-256: 9191911ac819977b454418e06d2c0859c2f15945a9d809e49879a45a3058c545
font_01_sfnt_off000122cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADD 20308 bytes
SHA-256: 5752d9f8b59d5467a5ef600cace4f0753a081c6cdc26e256344527a50b2e16bb

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