Malicious PDF — malware analysis report

Static analysis result for SHA-256 f452b0fff71fd4b7…

MALICIOUS

PDF

79.8 KB Created: 2021-09-07 23:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 202d7d12890f79203641101f6fefc09f SHA-1: 4505d0bc446cdf7aa9aeb966a50ed9acbdaa7e8e SHA-256: f452b0fff71fd4b74ba7258eea1f139213e5210bd1d4ccb6bf11e8ae83ba65e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, pointing to a tactic of using link farms to obscure the final malicious destination. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=file+convert+into+pdf+to+word PDF link annotation
    • https://ivanda-commerce.hr/userfiles/file/98234716464.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/78915020101.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/77777409695.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/15928249126.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/98427432254.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/76713583027.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/80700940809.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/406d6511fcaf4ee6f12224cce0bc35b4/5221868561.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/8rg5f7pauf6ov2dfej7d49uoi6/fezetozufoxesosetopunexug.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3c1451192---taripifogexagi.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/5d24gjt52l5ssf5865e61ju3c3/37327372975.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/g0coomjdr5aucc2p19intpaupt/85087496174.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/28884978985.pdfIn PDF document text
    • http://aimic.com/userfiles/file/97696010243.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/e434139e19dd0c85e9cc0b95099ce566/54275018201.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/givugedobonize.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e9029e8272c---56108816679.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/68945591021.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/be2beea2abd5ae22343819a8e4a88139/demipe.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b212383d939---xibimubixikekawujatagexom.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/milewonazezumetenagelum.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/basolozozavu.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/06682241a8551c36c079b65126f99b1e/rigozeb.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_off0000d537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD537 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4E 10412 bytes
SHA-256: f0bd561f323ab52d0178cf7fe993f971531ba417ec80666e5cb9766ed6d8f073
font_02_sfnt_off00010501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10501 17256 bytes
SHA-256: e8fafd6683d1a4f229c1b331fd8359a74cf4767c3cea73261138e7d8d1e80646

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