Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90256ef150e2e17…

MALICIOUS

PDF

71.9 KB Created: 2021-06-29 19:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43cc6f1ef6afacf5455bc1cb27497f60 SHA-1: 377b0e366eedd0dfd702b5f7f6443534e799e77f SHA-256: f90256ef150e2e17487a910ac98eae2de5d165d4acb211f6f1b3c3c1a87c9e97
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing lure or a dropper. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites hosting PDF files, suggesting an attempt to redirect users to malicious content or exploit vulnerabilities. The presence of multiple links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bc097aaf9---68060061635.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/725fa248068e128bbb4eb1635e2adc71/9316574836.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee7363c5f2---kiwisizujimituxovon.pdf
    • http://allmedicus.com/userfiles/file/telorowokuwajalunew.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ce914b78bc7095f0a49618558a2427f0/mukoxeduzifinuvatosexa.pdf
    • https://oncetrabzon.com/resimler/files/33916671510.pdf
    • http://koszyczarek.pl/userfiles/file/36525744200.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/24e31b41660c72c35a00c8fa8ee1b84d/duzevugikolufiti.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/8847e567c5018eca402739c4628c4169/30209028200.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/4a2222607941872bec5e8b7fbdc85d3d/waruworojitujivajov.pdf
    • http://ngocvietbungalow.com/upload/files/gapavuxawutejat.pdf
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/94444558148.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/jdui65rbk496scu3r2gpn1f392/93879370834.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b103c0a27---kubifitilokofixaxol.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/b15e7055e9d63bdcdb1f40caa1f3d5dd/kevaponetujopozetaleb.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/o0c2gnp8d16662iqe98mvuph29/2705989155.pdf
    • https://nnt52.ru/userfiles/file/68045038933.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/44b076989d69680cddcd3843998c2e0e/vonum.pdf
    • http://scantech3d.com/files/dojagubufifabi.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/d86faf6b53ab15e572590f7294ecb17e/76397123627.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835623d5f3d---56159325633.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/5ef483cda23df7c234ed7f95dc5cebae/kizupovevapogezawubiw.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/98f8cefca5a493f2186f1b17fa52739b/3454890663.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=android+convert+html+to+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_off0000b87c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB87C 16792 bytes
font_01_sfnt_off0000d08e.bin
c60b12a2a663b8dc2e93c05c5c5361b2e5233536a8cc078af64176b4befc32cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xD08E 16116 bytes
font_02_sfnt_off0000fa3d.bin
dfd6792a338628e26f10836594129d58477219affdede34b60dcc107662140df
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3D 10600 bytes