Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12428f65d6d3cc8…

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 18:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 93112e9499fecc369c034ffc0cf5d46c SHA-1: 1a315d2eb2a52a2c1f173e3af5e3d718a3deb9f4 SHA-256: b12428f65d6d3cc85d537bca2fb96860d3cdfc0a1b172e4ae9c6c264f61d9c9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that form a link farm, likely intended to redirect users to malicious sites. The document body is heavily obfuscated, suggesting an attempt to hide its true purpose, but the presence of external URIs and link farm heuristics strongly points to a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://smidgel.ru/uplcv?utm_term=rss+reader+apk PDF link annotation
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16134bd413307f---xubim.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/71511475545.pdfIn PDF document text
    • https://digireg.nz/upload/23058713797.pdfIn PDF document text
    • http://winso.tw/userfiles/file/fegerixopod.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/f582a602a59602de08a3095acf828108/17135615534.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/80871274068.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210906170048.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/aba80e7f0620197aae0d4ac088291d99/86820223520.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/lugawovubijefegi.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/40372837981.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddf2d0c466---50512925194.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/42951057698.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2b8843264---kekopafazufiw.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/72587169411.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-12-07-07-56-rm8JlDBi.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/421162799dc9171be306764a91797009/dudesadosevenomesasinojib.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/57129818520.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/3443662394.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/35906300864.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/50402650881.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/tomimosibibolepo.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/b8a1f85ca3f6ca32ed928d2c14ae3434/66897258358.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_off0000da57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA57 10064 bytes
SHA-256: f90b89dd7f306e6a1abe1e8f19e0d9f3a17251367f059aa66d0ed6da717a4725
font_01_sfnt_off0000f0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E9 17152 bytes
SHA-256: efaee23beec2aeb94dbd5ed8c8d46ec9a6c4c9aea9e45f28bc024596c48aa19d

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