Malicious PDF — malware analysis report

Static analysis result for SHA-256 acaff86635702d02…

MALICIOUS

PDF

82.8 KB Created: 2021-09-10 21:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5deac0809ee45e2b76a827c600711e56 SHA-1: e5992e888b9772bb1b8acc9ddc88c9289b94fcd5 SHA-256: acaff86635702d02d3aa5302e8d3a6ef6eae0c2554c562743b055d9593c2f103
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 CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://pistant.ru/uplcv?utm_term=2020+movie+streaming+sites
    • https://eownauto.com/uploadpic/files/zezovi.pdf
    • http://hilimall.ae/uploads/files/98880206841.pdf
    • https://maintogelonline.bet/contents/files/62822742077.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9195d9fe4---mupikonuzevujolupuja.pdf
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/tesonoxivawofiguloliwe.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613711174e229---94877195839.pdf
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/zugusupovubesute.pdf
    • https://exam10.menapoint.com/app/webroot/upload/files/32617049394.pdf
    • http://lutechmed.com/Images_upload/files/82852028661.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/aklt1mb7kdfuujk691jns9sun7/vegov.pdf
    • http://poongdung.com/FileData/ckfinder/files/20210905_758500F3CFEBC2CC.pdf
    • https://safarekhoob.ir/basefile/safarekhoobir/files/68757084204.pdf
    • http://gabinetortodontyczny.eu/userfiles/file/xobewunizudevuzajuned.pdf
    • http://pharmabiosolutions.com/filespath/files/20210906041621.pdf
    • http://litho-and-co.fr/ckeditor/upload/files/xamosawiladotuvuxijige.pdf
    • http://prestinoequitacion.com/imagenes/upload/files/fidisezilimozid.pdf
    • http://trieuduong.com/images/Download/19076270905.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b29216986f---jibowakomedemudajuj.pdf
    • https://ms01bet.com/contents/files/junimodis.pdf
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/63269310826.pdf
    • https://newtech-utm.pl/userfiles/file/40856233422.pdf
    • https://simbhaolipower.com/images/file/22223748902.pdf
    • http://ozhelalikram.de/resimler/files/66663089612.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_off0000e089.bin
f2d3b3c1c8604148041bcf8e47a67f61f5c109b866223e36def50428915407e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE089 17200 bytes
font_01_sfnt_off00010d4d.bin
69321b43dd8f87c13b54528f51a218776f7f6f5a28ff3176c165d24fe66e9f2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4D 10616 bytes
font_02_sfnt_off000125a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125A0 16792 bytes