Malicious PDF — malware analysis report

Static analysis result for SHA-256 15b1722dac57a3dd…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 06:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 611c967c3c2a134e42b093dabfc88a47 SHA-1: d85518ce4cf16c93792f78969e2eac8c08b7d83b SHA-256: 15b1722dac57a3ddf6cbcd35d78599e999607ba340b6d953aa86dff84d4a6725
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links to external sites, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to distribute malicious files or phishing pages through a link farm. No scripts were extracted, but the overall structure and URL distribution point to a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ketchas.ru/uplcv?utm_term=transfer+files+from+pc+to+mobile+without+cable PDF link annotation
    • http://songhakbbq.com/uploads/files/lamavogasal.pdfIn PDF document text
    • https://rm-parketi.si/uploads/zotesigagupupogafuneden.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/38484853217.pdfIn PDF document text
    • https://ijp2.com/contents/files/49830615444.pdfIn PDF document text
    • http://besteva.com/upload/files/42699552824.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/63269762778.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/34880337952.pdfIn PDF document text
    • http://stromzeleny.cz/file/ravagupetezak.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/365739040.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/587craq4bnk4a81suum2qtnbch/toxowijesujafalabexexoko.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b4dfac454---85825436455.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/pabidifupejudu.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/wizubewarekometazegamemet.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/30690154491.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/45297972648.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/40288999982.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/jivulerezixepetegini.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/36683850923.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/63461255530.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/f12746d204cf53245fc465b1aac531f6/97034513101.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/42310036779.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/207309448461407973bcc73.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/1710994098.pdfIn PDF document text
    • http://poliinc.com/upload/files/68099687881.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_off0000d24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24D 18376 bytes
SHA-256: b3550d199cc945843f8d821162ff6b4ea0b769064612d931a2bd9306aa414612
font_01_sfnt_off00010196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10196 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AD 11036 bytes
SHA-256: 9511c98e39612f7879d832e7f34bb39d9d718fe9310fa96d2e0e24d306f5f8b1

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