Malicious PDF — malware analysis report

Static analysis result for SHA-256 fafd9295990298cb…

MALICIOUS

PDF

77.1 KB Created: 2021-06-28 06:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ab4d103ed4cd9af0c2178b506015754 SHA-1: 312add3bda5dc71bb72bf96c4d973ce8871e4559 SHA-256: fafd9295990298cb5db9b90536e12e3343fcd9ba9690942c57247f2a617414fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://crysiq.ru/uplcv?utm_term=the+electric+orchestra
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/14c88cc1eb50615d8092097e2bae35ff/97253247155.pdf
    • https://perfecthospital.net/FCKeditor/file/fewololupi.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5f1572010---46497302717.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/78125e1622e23d5107486cfd347f043b/jilapiravalefefi.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160aa18d5465f7---gigebabakiwigizedamiso.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/lcediurg2dn15rjiinnk8heeu6/13011445838.pdf
    • http://toonesk.com/upload/88592105219.pdf
    • https://bbpartner.cz/userfiles/file/21828690731.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/70d0204ec11df7156bc91eb149ba8d66/91503103018.pdf
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/3ea35476b6147c51c36078ad9989803b/71573586776.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ba2425c88---fufubodikesivuwaliluf.pdf
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/1116c984422ff75cb93aea6949ab631a/daxidamapeb.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/1d300d4acb6c95706de521e231b543d5/39863908282.pdf
    • http://suapaiatuipelehakefamily.com/clients/80707/File/40276403355.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2648b0708---60218677414.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/47fe7f2ceecc2c3e428c70e61917d478/17478293713.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160864171c1549---49869666335.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f79e34d9---vuwoligujed.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbe1f7a56b---bozobezewegojivob.pdf
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/d4f56c3b01e7eb9c7c0c0f8a870699f6/rojesi.pdf
    • http://stpatricksreunion.com/clients/84553/File/xulebukupekemefaline.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075930aeb428---puwonanaribuzuxosad.pdf
    • http://trustycctv.com/ckfinder/userfiles/files/79575537760.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad12de0f527---lolitogudu.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/bljgfgoccof851ve715fg8qpk5/13477917632.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be54b758561---26615408183.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_off0000ce5f.bin
227c990dacfc00f8ca298754f2c0ac2a239cec9483a8e425c0c7c12ec5dba7a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5F 10184 bytes
font_01_sfnt_off0000e558.bin
3accdf848c5f34ff2574c4ab705b82b8808fbb213d2ee6d487a7dddc9d0f2203
pdf-font-stream PDF embedded font (sfnt) at offset 0xE558 16316 bytes
font_02_sfnt_off00010f22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F22 16792 bytes