Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5bfb788c8916439…

MALICIOUS

PDF

87.7 KB Created: 2021-07-07 08:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d43bcca2817a7457d45e3d409a87aff SHA-1: 7f3f12993bc0e32638119e33be186c539227a035 SHA-256: e5bfb788c89164396c3eb69d854ca14f42024c62e1bbde5c1fa86d2de04d6caa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/3140a299ea9e4de3651ac4a2e414985d/64683726468.pdf
    • http://www.alfapilates.pl/upload/file/13544110072.pdf
    • http://goref.ru/files/file/bokol.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a51d7ebba---2077807008.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0231999cd---batowutefozixoj.pdf
    • http://www.ufolep-69.com/contenus/files/laruziridipobuj.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/9d52daa3203ea7b363188c60fc4e78b4/69538102615.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd9fb44a31---68467161014.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0ff830827---dobugovinizujiwotomufud.pdf
    • http://yuha.be/_files/file/fufodavokebub.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/192374dcffc67a7e7ba09e14724636eb/70743619952.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c7face3b5c5c60580c9814d440d5fc08/joroful.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/4ed0486eca03fd24d6f68bcd4f99cae2/kemivoxizewololuwo.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/edu95cfk9ugnmauqvheuupfvrb/rofasivowu.pdf
    • http://qca.ch/userfiles/file/437276916.pdf
    • http://espacioschillout.es/images/admin/file/pigaw.pdf
    • https://kurtoglumob.com/upload/file/ligixizorabomo.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/d3bede6ea6f19c3cedb5356fbcf40d34/gadosit.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42d368e436---vorobemesi.pdf
    • http://meteosputnik.ru/userfiles/file/84024634594.pdf
    • http://asremajazi.com/uploads/files/mitujaxukotuvomonava.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cc2f7bf2b4f---89871565493.pdf
    • http://chieucoingason.vn/files/55867011125.pdf
    • http://bularz-auto.pl/images/userfiles/file/29344377997.pdf
    • http://harasim.cz/uploaded/files/ziboxitadodegabijidog.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=other+names+for+lanolin
    • 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_off0000f33a.bin
f907737871a8103b3b9d3010e689ccbb950663342b45654e73166f1c0d77257b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF33A 17780 bytes
font_01_sfnt_off00012201.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12201 16792 bytes
font_02_sfnt_off00013a18.bin
e03f50a29bb99c0782caaa85e3b04641f4014edcf08ca46cfaae8d2321591849
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A18 10504 bytes