Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b3646970e2ffec…

MALICIOUS

PDF

80.9 KB Created: 2021-09-20 04:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4429be121af7965832e972f96c0bdbe SHA-1: 49d4cc2315673dc51d78302b8f2f8776286d4575 SHA-256: e9b3646970e2ffec333d90aa2aa520e280db1fb4985e5fb5a35c520a3bff5c3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/13246638551.pdf
    • https://karolinanowak.com/userfiles/file/lareniwedozaxilineri.pdf
    • https://lmcmanager.com/ckfinder/userfiles/files/wijagibikebitoxajesulun.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131cff42ce6c---23119100237.pdf
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dobuwezilovivowebesasir.pdf
    • http://electriccityusa.com/images/fck_uploads/file/dakeluvureser.pdf
    • http://bibliotekaszamocin.pl/img/upload/files/manujulevodaravigubufuvi.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/13d1ccac2309927bd8ef87f18cbeb7b9/lijilubunuvarubew.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/354639a2a25196012824bfc3fff3af22/pamexufuzezeriniki.pdf
    • http://csaladiegyteruautok.hu/userfiles/files/panexatefabejamobubar.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/8c80668d60e9af3956793ca02ecbbb3c/65746265106.pdf
    • http://ventss.ru/userfiles/files/pemawerawataw.pdf
    • http://vanprodukt.cz/UserFiles/File/xanivuregoref.pdf
    • http://liderzy.natura2000.pl/imgturysta/files/99212258989.pdf
    • http://lemma-studio.pl/userfiles/file/fudimirubedumosuxovuki.pdf
    • http://qianshunqs.com/admin/upload/pobodi.pdf
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/33249241313.pdf
    • http://akademibt.com/resimler/files/84957994849.pdf
    • https://we-plus.tw/ckfinder/userfiles/files/kafuto.pdf
    • http://zatexpress.com/upload/userfiles/files/winidijagekitolagogaja.pdf
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/kebemoronurigafaxulafegi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+change+alarm+ringtone+on+android
    • 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_off0000d86b.bin
aa7ed3e6b55257bd4be86a7e83f4f8bfc673ee2f3032b86c9092a1763e1552cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xD86B 17512 bytes
font_01_sfnt_off00010555.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10555 16792 bytes
font_02_sfnt_off00011d6c.bin
05bf8295a22da187c611383cd9abd6267524ef5459a5d551c04897e435e45b5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6C 10724 bytes