Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ef7d093e51d6d5…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 11:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7886750e1144a4e70ff6cabd80b05114 SHA-1: d16683b0764054c9f8f609101b99627491ba408e SHA-256: d1ef7d093e51d6d5e0879f5504a53fc6f836eebf6befb4b14f06ec841b0bbd79
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing numerous external links. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs point to compromised WordPress sites and other disposable hosting, suggesting a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://allytemp.ru/uplcv?utm_term=talking+tom+hero+dash+mod+apk+android+1+com
    • http://condominiobrisasdelnorte.com/userfiles/file/nerugadonosoxo.pdf
    • https://hunglivet.com/uploads/files/202109130523438319.pdf
    • http://re-media.ru/foto/ck/files/27637459824.pdf
    • http://fusiongrup.ro/userfiles/file/31182669633.pdf
    • https://aprenda-atdi.com/uploads/files/94828137990.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394fc25a271---ruzawegosidodaxar.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebca4bf183---jokeronoso.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/rukalesejebi.pdf
    • http://lawyergz.net/uploadfile/files/56554186683.pdf
    • https://terminarz.online/kosmetyczka/krakow/files/22416887004.pdf
    • https://oncallanatomist.org/ckfinder/userfiles/files/kizolamasateranovot.pdf
    • http://orlickachata.cz/files/files/62311834218.pdf
    • http://paglialonga.it/userfiles/files/29915481105.pdf
    • http://www.peritaonline.es/ckfinder/userfiles/files/desilami.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/b6a6ff1470e5d9eaad7c15f0fbfbb593/bagesenorapidekubagarega.pdf
    • http://career-id.org/ckfinder/userfiles/files/bimijiwanukabojaze.pdf
    • http://abcbyspu.com/ckfinder/images_store/files/vejapimotoxuvew.pdf
    • https://edex.co/userfiles/files/mososuk.pdf
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/85140382327.pdf
    • https://jamuiboe.com/webroot/upload_media/baluduzowudesoxuzavere.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc340bbd8a---zenezijalenewaz.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/04a4714b7180260e19773f6a38d78baf/lolowilutulago.pdf
    • http://hmsendo.pl/uploads/editor/file/57113383534.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422d918dfdd---78839940204.pdf
    • http://needychild.org/ckfinder/userfiles/files/doxedanulosifubiwalub.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3f7.bin
128934633fa00ce4f3a10c5a1bda563d64583f537ff0bf6c0b8590a8b3d21805
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F7 11068 bytes
font_01_sfnt_off0000cd66.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD66 16792 bytes
font_02_sfnt_off0000e578.bin
a7e7196187c2c3b880d4c1041d2aaee672d1ccab9a01f6d8b6582da5c1a98dc1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE578 14212 bytes