Malicious PDF — malware analysis report

Static analysis result for SHA-256 208847cc4cc30c08…

MALICIOUS

PDF

69.3 KB Created: 2021-09-04 12:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 283e36c43a6fb3e35f8a3e4e423d38fd SHA-1: d6c7c640c7de03033d721833d8151a41714052f5 SHA-256: 208847cc4cc30c08ffea12f469da942094333d7e931f17d3f135277062801253
176 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristics suggest it functions as an image-only lure, presenting a screenshot to entice users into clicking embedded links. These links predominantly point to compromised WordPress upload directories and other disposable hosting, likely serving as a distribution point for further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 69 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 http://mileschapelcme.org/clients/9/9b/9b85db73e8c1d5ae3bc18b6db4f26039/File/84224635376.pdf In PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/veroledilawu.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086580840a24---rezuluminitadegaxof.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119f63230833---sojikibijogilowoludazagez.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/pezekidixaj.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a5efddd20---laxosuwo.pdfIn PDF document text
    • http://rutherford58.com/clients/5/5b/5b2824e44de76337c32dfcbc3ee6dba3/File/53628275007.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106c250057c0---46460142979.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/cb9511029c152cfc847136ca62d291f9/bawonidiwuvevomimezigo.pdfIn PDF document text
    • http://wernitznigg.at/files/50363874516.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/puwipesazani.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d783e3187e---93887666201.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/mijimo.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/67936223468.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adb34b05d7---65104389875.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/86585973622.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fae456cad3---89975734448.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/dalotapetabanusoso.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/65465356245.pdfIn PDF document text
    • http://hanleyresources.com/images/fovotujazosefozegutufo.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/04c37f56a89714d516adf88f029133a4/43718268560.pdfIn PDF document text
    • http://proxima-design.cz/files/file/62008460034.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/95393047274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=glencoe+health+chapter+10+nutrition+for+health+pdfPDF 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_off0000b43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43C 13708 bytes
SHA-256: c83ffd6421730fbdb92d4e1967e3eded27d7e9bf165827656ce0b4af8326da61
font_01_sfnt_off0000d603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD603 10860 bytes
SHA-256: bb97b434a279f5057997a2bc9a9bc8a629fae2de5cab11ab3606a14cef077775
font_02_sfnt_off0000ef09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1