Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed16084f192a51bf…

MALICIOUS

PDF

83.5 KB Created: 2021-06-27 04:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc9a3eae0beca28423667539ad1c99cf SHA-1: 8324b0e9bfcc630c8a54113237cca6f18c6117ac SHA-256: ed16084f192a51bf24129ee32107fd33b8c7b9ba97d386f50894811a67ae1505
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories and disposable domains, a common tactic for hosting malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/6cd35c8c7ed61c785d5d2906b3d4f1db/19201468766.pdf
    • http://thietbiotovn.com/Images_upload/files/99397480386.pdf
    • http://vswet.ru/f/51685702339.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9f5b3deccf5a2702a88405e29dae101c/timudikojopod.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160839d3f208b3---tarubukosigobuxagorome.pdf
    • http://sacoorhealth.pt/site/upload/file/54835435488.pdf
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/zavuzasozizejemubaw.pdf
    • https://europartner2.pl/uploads/bukigula.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0556f2c435---19462721557.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/bqj7v8a55rsv3phv8534rci0km/nipame.pdf
    • http://solarexperten.ch/fckeditor/editor/images/file/jajugujetekimu.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/jidlnc5j7m2i16s745104es3n8/dejir.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/b6382ff2a03450f81ea0383ccc3af1e2/feketulawazizemelapep.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967e1e182f0---kedir.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/7802134946.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/m6dmo1svoru788td7np68af3m1/66372514100.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/9b9890bc72f8d3449722050cc115a08b/3133427144.pdf
    • http://munnarinfo.in/userfiles/file/90999224786.pdf
    • http://bukharajohnscreek.com/sites/default/files/file/karov.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/b18d1b0e7c1aa5fc0f3ca4be93d6de31/vupin.pdf
    • http://hasici-pristroje-eshop.cz/files/file/kuripozup.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1442c9b1bb---62389483483.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=acetabular+stress+fracture
    • 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_off0000e54a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE54A 16792 bytes
font_01_sfnt_off0000fd61.bin
763c05142ce854b551c8a271f22720b5356a8da50fb795454c3725cbb4b4add6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD61 10232 bytes
font_02_sfnt_off00011492.bin
905013d4257e8f824389c8a9ba0dde98cd9de739ca9afa17dbd4c4e5634edd86
pdf-font-stream PDF embedded font (sfnt) at offset 0x11492 16476 bytes