Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6e7db8c4649213…

MALICIOUS

PDF

79.9 KB Created: 2021-09-10 12:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 327e41924e9c662760cab2cd2a506826 SHA-1: 4d79540a989ade2322e4578c15a76e87812f6e81 SHA-256: fc6e7db8c4649213333e52519d689e074184a71d931d47d833f8528c8345028e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://catamma.ru/uplcv?utm_term=app+hider+lite PDF link annotation
    • https://childrencareandliteracysociety.org/userfiles/files/65179279023.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/63884303429.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/33365918750.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/25231871863.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/linetipim.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/98988810069.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/52762218490.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/85454209046.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/bewali.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/51299154741.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/dujonubixis.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/dotokurapagaferu.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/61611189485.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/garuxiwinokunegag.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/84512835550.pdfIn PDF document text
    • http://hk888.edo2008.com/com/comimg/file/20210909_015132_191.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a774152265---vifelabapufuwega.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16131d6054b5c1---tusuvitabadosulidixu.pdfIn PDF document text
    • https://lecachet.fr/docs/files/69902391244.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/45518204491.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161320bdc9c192---kafugepiga.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161381d0ab11a8---kulibagadu.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/18531834187.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_off0000d636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD636 9916 bytes
SHA-256: 8d87ab06302613eaa1fd32f7fa51f9211281f4c3f577478e97dbf9673ae4a63f
font_01_sfnt_off0000ec2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2E 17708 bytes
SHA-256: 7b5152c0e838cf0143c6da93cbcfc626748cc2e139a295d018c53667c1631b35
font_02_sfnt_off00011a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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