Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e1d85ade2b8e6e2…

MALICIOUS

PDF

73.9 KB Created: 2021-09-06 13:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3fe1015672204ca64699dc8085962177 SHA-1: 791457958c68995be1854e9b59dc0ba1716e9dcd SHA-256: 3e1d85ade2b8e6e2ce6fb78eddf9d3df4e76f4b03c4f1fa3ac83900b507bcdfa
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs, many of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://dui-antidote.net/images/userfiles/file/78305442387.pdf In PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/52840119829.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d362446e714---doxogawa.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/f1bh83b7ef6vtnua892hod35k4/90307756651.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/mezavomilugizibipabole.pdfIn PDF document text
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/84812301966.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/64306697677.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/dsecikp4ia2u79irnkagvo4suo/60555951635.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/52651382897.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/a72bc03523fa443658adbbc45e425033/vifolerizirupuzadanutere.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/jifomin.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d9cc686653ac0a42d9fb49ed80d64792/18366793890.pdfIn PDF document text
    • http://status.cz/UserFiles/File/lubezaregoxurabipikasere.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051004055473499.pdfIn PDF document text
    • https://sibconsulting.com/contents//files/bevifekubawowogi.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2e00a27b7---22458254009.pdfIn PDF document text
    • http://schokobrunnen.com/idata/niladejijifetefuxekixa.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/85b7087f576c6905d6d602ecc27f0c9e/mikotojabigezupa.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/gupakudesipejag.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b042d597723---19914955043.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b031a1e20---17826986771.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/39201505361.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/soregikakusebizaxagapa.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/026c131db0ba620e13bb41ecb0b0239d/salilefefanavagaxelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=musso+guillaume+pdf+chomikujPDF link annotation
    • 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_off0000c2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F0 14860 bytes
SHA-256: 8733981ffba76b3d54c83231341b081979acc746bda680c733986da632660690
font_01_sfnt_off0000e86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10083 11080 bytes
SHA-256: 49f5f4984be80aac91f2a0982c01109c966c43c7c28d1b54353dc48e924f09b8