Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed74c8c8152c4045…

MALICIOUS

PDF

75.3 KB Created: 2021-09-14 07:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8b021acc903a36da178f1d8af391345e SHA-1: 415c578d130c70e4a88a9d5ec822729186d78df9 SHA-256: ed74c8c8152c40459fc1be2bcd1e7073dcc037f38f7b6b8597b1b3b795fdfe55
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 of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, pointing to a link farm designed to redirect users to malicious content. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing lures.

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://medvor.ru/uplcv?utm_term=download+samsung+galaxy+message+tone PDF link annotation
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136176682c25---mowajebapa.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/81400574200.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/fumalupik.pdfIn PDF document text
    • https://petek.biz/resimler/files/vowiminunonabokuxolupiroj.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/54157783874.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/57400971409.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/34271677531.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/lugagamalefomuwokige.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/79046196280.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/toxarosomavefixowi.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/rokedurexelujoxeragareni.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/64050909506.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/61417312612.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021091012203773499.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/rejugurenidixuzegojanise.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210906110514.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/bekugemebofoj.pdfIn PDF document text
    • http://thepducphat.com/upload/files/wadema.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e5d30740a---58153527718.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/25870732776.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/jokoguxewijoli.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3a3a9f6ba---28877936640.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/foseg.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_off0000c21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC21B 10800 bytes
SHA-256: 3dd8269caaa40dc5b3799929e57997381731403b144556b9bda22dcd6c94cdad
font_01_sfnt_off0000daeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEB 17244 bytes
SHA-256: a3e56159a7a6ff92ea1637683e965101d7b8e033fac31531dd7ad60914446ebd
font_02_sfnt_off000107ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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