Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8a247e62bd8b15…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 04:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 72dcea5c56634cb132c6abd2ff17b5a0 SHA-1: a78f0bd3f6a3cf60f562b7b278a8b0d03b11c9ae SHA-256: 3a8a247e62bd8b154ea3da1815ac1ff0def62c332edb7f99cbb3e3969e0dbed9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=notizen+app+f%C3%BCr+android+und+ios PDF link annotation
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/ca940978b0b228deae01363ca08fe5f1/37252068093.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136eaa2952fb---72474751819.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/55997454456.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/23050982577.pdfIn PDF document text
    • https://izometal.net/mm/file/dixibaxirisujibeliwurem.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/wokojat.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341982c0013---1762956694.pdfIn PDF document text
    • http://border-collie.ru/sites/default/files/file/30197754191.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/99748619450.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/fuwerumuzewazetofop.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/bifapomepewaviripe.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfa61d32e5---limujelemus.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/29821437022.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/liwusuju.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/76253085182.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e71289b213---zifusomog.pdfIn PDF document text
    • http://i-dron.cz/data/file/bivibimig.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/rozadizuxode.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/93677432981.pdfIn PDF document text
    • http://myphamasia.net/upload/files/nakuwinumugomunije.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/49611629191.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/lulojazudosodigasi.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/23127989936.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c947f42d41---kijoxitatifuwasijefaf.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_off0000da0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0B 18472 bytes
SHA-256: 9c98d445f7ca01dc31591a7dd7de507a4c3034936ceb846d0266e445e1142c3c
font_01_sfnt_off000108a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A4 10772 bytes
SHA-256: cdaabc4af93fd3ad13dcc29e3aa0946453b94ea143af7815d8756a84e0fbbf73
font_02_sfnt_off00012148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12148 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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