Malicious PDF — malware analysis report

Static analysis result for SHA-256 10d2b0ff96ae9cba…

MALICIOUS

PDF

82.7 KB Created: 2021-09-22 18:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 473c0ffcc9790791744dbe7aa60f7681 SHA-1: f206b134a3f0a4b74536a570cea009003f540f84 SHA-256: 10d2b0ff96ae9cba784979f173b901cda6f57913429b9e5d4ba940703db5c235
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports the lure-based attack pattern. ClamAV detection and ML classification strongly indicate malicious intent, likely related to delivering a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=free+psn+code+generator PDF link annotation
    • http://nc-israel.ru/upload/files/miwelegipelobaxode.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090901373973499.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/jidikakumigidulozo.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/jikijulusijipet.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/19233188296.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/44633374970.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/milizuvivunadet.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/fuwovusizojavodibavolepar.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e0da69260228b6b590a8921d48cbc9c5/50982813545.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/ratekogisojajag.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d83193995d0bc8ccc55d29651a5d2be/wajasidawevadut.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/dajamuzepazadeduke.pdfIn PDF document text
    • http://cplust.com/upload/serback/files/20210916221250.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/09f8a2df6fe009fcf2cf6d80b33fbaea/87408768869.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/96076371278.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210921135234.pdfIn PDF document text
    • https://maturana.cl/upload/file/suvijexosozowakodazugewi.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/46186246991.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/98846152902.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/nopubos.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/56202642049.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/mijilimosa.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/bupenapitawalowiwo.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/85168345059.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_off0000db35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB35 19152 bytes
SHA-256: f599190551be09d89ca0905a268bf7028d48ddfe1f5179e4dcf74358e7ce0076
font_01_sfnt_off00010d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6C 10528 bytes
SHA-256: 61b7981949762792e540922feea3a5cfeb5aeb6782fdb2e68ac819afa37a9ac4
font_02_sfnt_off0001254f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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