Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b53988e1a7a335…

MALICIOUS

PDF

115.7 KB Created: 2021-08-01 21:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 52457a98d94d64776482c72e8ff94625 SHA-1: afe00ce901580bd32a705d34014efe05d023f61b SHA-256: f5b53988e1a7a33537fdf3823f2b53969b97b8def79485a9a12b11ff7467f489
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nomylo.ru/uplcv?utm_term=sample+hoa+bylaws+california PDF link annotation
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/864777be636811dcf5dba94f49e401d6/siwijevewaguzupa.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160838c977b968---50516321593.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/69894517253.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b4faa667672---lumazujelejigaxug.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160945cc73c5f0---80569851205.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f793f97233d6fa452dbfab3cdd947c1c/55729568120.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/517dqnqstp1d7k9au8ord8b9i7/78092190311.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/dugoje.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/7804q5a1kmsvu3ftidoi7pia00/wulabim.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/89883485945.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160aa976524cae---tigajudozim.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/69120687579.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b92ed54a0c1---30464021656.pdfIn PDF document text
    • https://hanul-muresenilor.com/wp-content/plugins/super-forms/uploads/php/files/s8sc3ejin9brst7jen9v55r354/lugezelasebuguravamo.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/07fc41d454ce74a4e9560144368e6835/19257997329.pdfIn PDF document text
    • https://www.roadsafetyrental.com.au/application/third_party/ckfinder/userfiles/files/50950063724.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/50072262711.pdfIn PDF document text
    • http://kokalietudarbnica.lv/files/files/41427609890.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe6365d561---nudukefugevefav.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/38882253721.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/rujikabunurasoru.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/052488bd40c122b58ae0b952a27cda85/6070278938.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_off000160b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160B0 11060 bytes
SHA-256: d254340f177e21010c1233fde7635cba19f3e8391e3c13c0fe74b8ada415f95c
font_01_sfnt_off00017a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A08 17692 bytes
SHA-256: 11c3d0721c4308eb9e3deab657456b427e846aa46b098acb990b2a1061f6428a
font_02_sfnt_off0001a87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A87B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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