Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe370abc5ed705b…

MALICIOUS

PDF

89.6 KB Created: 2021-10-07 05:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: bea3f494dbdb60bbee47ad29fedd770b SHA-1: 1d94588cb1fc58c25275352572cd5bd585671142 SHA-256: dfe370abc5ed705b875005173f2e2d9d01867906157b9a16101abcf2dffed676
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://topbondtape.com/uploadss/file/pomeliwoberopeketeberopa.pdf In PDF document text
    • http://www.flamanville-76.fr/upload/file/2470857911.pdfIn PDF document text
    • http://gazetavk.ru/img/file/nenepivisuxisopive.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/59815735901.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/16795964346.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/foxozikaradijatoguso.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/5945834248.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/bamupixaji.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/jepelimatonuxudajob.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eea8106568---84632856644.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/15483491184.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/nolov.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0abf94b70---zapemokosarumedura.pdfIn PDF document text
    • https://12waktu.com/contents/files/9950887105.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/zumetozilutu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161354f2e57870---73553101417.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/1791517785.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/fofuvakufananixovirav.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e31e69c4f9---82827513920.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/30510221366.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/bedufigotuzig.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/67474474568.pdfIn PDF document text
    • http://theponghop.com/upload/files/vajolemu.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/21361381206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=maxims+of+equity+explainedPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF491 11012 bytes
SHA-256: d72eb2ff2b1335a01b88b33cdcd12643a6cb7734efed7669e853fae1b3079e91
font_01_sfnt_off00010e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E00 19300 bytes
SHA-256: 0d3c10d424e0ce4cb9a2f8c0f84f7eccf139437dae4cc0afc365e0b383e19e8a
font_02_sfnt_off000140b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1