Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c071bebab5b5ca…

MALICIOUS

PDF

79.4 KB Created: 2021-09-08 15:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6885cfb67175da4c1fbdac1ab3c37c12 SHA-1: 7ac79469caa4038f77c0687a35843a310edc6865 SHA-256: 61c071bebab5b5caf3c4587a14b874ad9169d183f8a712bcc7ca534df579140c
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The embedded URLs point to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and contains no readable content, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://allytemp.ru/uplcv?utm_term=stompin+at+the+savoy+piano+pdf PDF link annotation
    • http://aloisiquadri.it/userfiles/files/vadipobuveduxuxugerasu.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/vazimeledimutobo.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/10895539668.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/risul.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/pavovo.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/52269052149.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613260d0dc73d---97319583440.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/e55f971118cab553da83e6baa83d8109/xiresozo.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/zitixaludilejopezasubeju.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/94797862676.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/foritoduwagab.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/79100586743.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/pebikubixasagafuj.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/vawusoximutudiwipema.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161366c4ddfd24---47160943887.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/1980003601.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/51066951824.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/gugepimudokudimobew.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/tujurovazataboditefajel.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/17449698030.pdfIn PDF document text
    • http://sireny.net/share/files/sabexipujaboxigoxo.pdfIn PDF document text
    • http://chenruichem.com/upload/files/werebesupekol.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/16371943191.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/49718374929.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_off0000d2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D1 10872 bytes
SHA-256: a7f4011b7234b13ab8f496037cf475e1c0afacf4e0113fb2384fe0a72d221bad
font_01_sfnt_off0000ebc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC3 17076 bytes
SHA-256: cdca9b0ecf11758652aecae632a610146d000d66989425666e830485dcb6a849
font_02_sfnt_off0001185b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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