Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9f22ba7d6aa4ce…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 17:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4bf180d667863a74ecb831ea68f262fb SHA-1: 0cdb10d65905136fa7e5fd20c04bf958b2abebfc SHA-256: da9f22ba7d6aa4ceba4b6714dac0dd042e7139ed378a79c1b261914c90aa4a82
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=android+1+assassin%27s+creed
    • https://derfo.info/resimler/files/xefizadumo.pdf
    • http://another-partner.morefriendship.com/upload/files/61122685990.pdf
    • https://esofagopisa.it/userfiles/file/85010237780.pdf
    • http://lnimeina.it/userfiles/files/birubodikarekosaliw.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16142c5a27e763---57731061209.pdf
    • http://tradotel-riviera.com/file/xizijawovabu.pdf
    • https://minipowerpack.net/upload/files/mufaritimavuluv.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/n5tps8b231gqvm0mohle12rk74/poledutusokijes.pdf
    • https://shatalarab-llc.net/userfiles/files/jadobitib.pdf
    • http://brenno-tojestto.pl/userfiles/file/ronokegizopufatebud.pdf
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/95888655616.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/7e477d63d0267a92254cb484c82c8161/nikawokuxotafokete.pdf
    • http://hueide.com/upload/files/84195626280.pdf
    • http://jca-t.com/fck_image/file/38369768893.pdf
    • http://nprofit.hk/userfiles/89355821383.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/d0ef8d33c5e0f10dea021eb8034835d5/80626904528.pdf
    • http://frutapac.es/ckfinder/userfiles/files/45329577248.pdf
    • http://www.aportecnica.com/imagenes/editor/file/mutizomelufofogam.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/botsga7det5vb8m3uhu9ej5vd4/85449809176.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c1263572ffc74dd361184375c1ff85e7/kemasuxodewolemapupugoti.pdf
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/jesisojaxuferadupivugusir.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b0de64066---jojapaxukaxilofu.pdf
    • http://azstorestudio.com/uploads/files/tomofixa.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_off0000dfb7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB7 16792 bytes
font_01_sfnt_off0000f7c9.bin
caf0c7e54aa45faa082f5838a45793a4f19b518d393c2d1dc8b171f290529ad4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C9 17956 bytes
font_02_sfnt_off000125cd.bin
11ed422c55cc7b8381f60481973c6fb5e78929dbfe73acf33181432aac7af4ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x125CD 10288 bytes