Malicious PDF — malware analysis report

Static analysis result for SHA-256 4356732e88406090…

MALICIOUS

PDF

80.3 KB Created: 2021-09-15 00:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 99bcab44a224c76f6e57b2d4516a92dc SHA-1: e75b1ac7b5c31892ef0a2a44c8df12628668c945 SHA-256: 4356732e8840609029e10c8f24b954e4c2e7496d1b810c65b8e38c00dc3d5eeb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and flagged by an ML classifier. It contains embedded JavaScript and a large number of external links, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely serves to further obfuscate the malicious intent or initiate payload downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=csv+datei+in+android+kontakte+importieren PDF link annotation
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b49bed4948---keligutuwepazakinir.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613fab9d72b9c---tiwusabizekesevalevujexon.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/wujarafipukesafizipas.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/seduxix.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/84478857087.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/wulasulaf.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/fotupep.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/vidixuxamisujojewodeve.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/fokipupunaxojosub.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/14222465090.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613283e176810---kekopel.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/5550278954.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/68351605483.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/fivazazozijalewadep.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/wujaliwonaji.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/nikejetuketevisopixo.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/sepepinubatu.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/59732869685.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/18197055000.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/45053460943.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/bd54d3b83ca5863293ee6b756597c536/64995136953.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/57e11c6205ba767c55edd5ef55fa688c/80129224472.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_off0000d085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE897 18928 bytes
SHA-256: e54d33a35516d98f242cfbe20ebdf551c5ff9005a415e6becdf63df402b96178
font_02_sfnt_off000118d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D6 10696 bytes
SHA-256: c518cba588939160689537e1a925b7a6651c3c419dee8f632baee58386621ad3

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