Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6c4b33a0eb2d65…

MALICIOUS

PDF

178.0 KB Created: 2021-06-27 18:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87b96b7f52b1e5ff3cf5bd543107f2ea SHA-1: adb2b51a6b5c885e76e998b7741388684b6b3da4 SHA-256: 3d6c4b33a0eb2d651f10d5746cbcd44fd0ca6f133c23333e854531b549105a5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS uploads, indicating a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the presence of external URIs and the overall structure point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9714

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://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2404ed06d---liwosasajalejosipoxud.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869c1198489---65279363059.pdf
    • https://aronabritcan.com/userfiles/file/mekowedaf.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/30n5mac5h2r9cedtt45vhjoq8t/99074006220.pdf
    • https://uppersanduskyrotary.com/cms/files/File/66454204070.pdf
    • https://cuisinescartier.ca/upload/editor/file/46525726932.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/74rfr21da4217g57vm8u7m1i4d/6993402774.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4af53d3a4d---52210320112.pdf
    • http://montaze.org/democms/userfiles/file/81732043573.pdf
    • http://jnafarms.com/clients/864068/File/mogew.pdf
    • http://chapelguild.com/images/usr/45195709164.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ahtbvpa32fggtqsusog06pcao7/nagefufob.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/eb6032d2fe625882ad2dad19bf032060/fozezof.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c88505785c4---40724389993.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/04b0fcabded7fa88f9546e6ed190403c/kilozegojol.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/0ad8379af98ad390c3c6753f12f5a8c2/5044702957.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/252ad75bd33404af50f56cd4e2f8b258/10554020723.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609261d92ae86---mizomewuf.pdf
    • http://primaneighbors.com/userimages/92424711664.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c818b863dd17dd3494a9664384de97b4/kupifoselinifeliw.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e7d679bfa---tutifajugusubepatem.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/nkhvpbeukrk8ngis2jgq11p7n6/60227877125.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/ovhuibr23nogcgk3js5s9gdrcr/temikivexesedok.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=example+sentence+of+effect
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00024f44.bin
269a5618b6ee38598bab2c3c8e6213ffa9de7487a819e399752854b1e1b31191
pdf-font-stream PDF embedded font (sfnt) at offset 0x24F44 10532 bytes
font_01_sfnt_off0002674f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2674F 16792 bytes
font_02_sfnt_off00027f61.bin
eebbe3d5f0c7560c35ba8d10603c8bee161cf8d2e14305090d7f5952810c2242
pdf-font-stream PDF embedded font (sfnt) at offset 0x27F61 18156 bytes
font_03_sfnt_off0002af34.bin
54ac8281eec1f904b8d0dcf3fdfa03c472114f93a454b548bc9c8efedc8274b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x2AF34 2064 bytes