Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d50a4789ff1302f…

MALICIOUS

PDF

92.5 KB Created: 2021-06-29 10:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4389520f814ad5b4bbe83c29b01f80a5 SHA-1: fd274c5b4ced8d298dc5b7ffa399ee82101b4a84 SHA-256: 0d50a4789ff1302fb6c68b2607c5e32c16de607f66edcdb3d9e3e2bf9ffd5384
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of an advance-fee scam, using lures related to lotteries, prizes, and parcel delivery to trick users into clicking malicious links. The presence of numerous external URIs pointing to compromised CMS uploads and disposable hosting further supports this. While no scripts were directly extracted, the PDF structure and heuristic firings indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://synerhu.ru/uplcv?utm_term=basic+general+knowledge
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/e9b5365e573006d965d102aca3657cf5/30711880487.pdf
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/59015704525.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea2a10fc80---pemixofedadujuwubuvu.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/4572536b91c20db317aaa89a8e54e818/30218524558.pdf
    • http://computergramm.com/userfiles/file/11117912119.pdf
    • http://allasclub.com/campannas/file/xokodopeb.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbf1966240---xowibiwi.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607918610faea---63015300383.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/fawumusotulaxurowuner.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/c1246cbb6f7379db812e253b285f5709/xifode.pdf
    • http://iltorg.ru/upload/file/polutemizalokaduxegaw.pdf
    • https://meesens.be/KrMee/Tekstverwerker/nedera.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/9mjdouccb2qedi0dg51cr0eqbt/19708670227.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16073a5ba26235---kodamufirug.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/2b213jm7k9c6i4kev2v5e22npb/348404990.pdf
    • http://selfmadefilms.nl/userfiles/files/5154819767.pdf
    • http://cyklo-sport-servis.cz/UserFiles/File/98388297406.pdf
    • http://utuin.net/files/fckeditor/file/famujapesugufulu.pdf
    • https://akemi.ro/hirek/file/gogebuzidorugesi.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bb7992c7b---47713760768.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/r70k0tp53q1jl97djnculom30n/vixanoxitusobexorub.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/3d76d0c30f453c9ed40f42f29ec1acb6/radotilenisavotedaj.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0e4af1145---rojakivuvoman.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/2197163897.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_off000105a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105A4 16792 bytes
font_01_sfnt_off00011dbb.bin
9fd247b062a569d2403c8ee8eb8746bb62685a03ae67c9b2e37e48240baf05e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBB 10680 bytes
font_02_sfnt_off00013631.bin
861d9c8db4265aed06087a8b3180b7c3921f044af70ec86c71f715e36b6a2880
pdf-font-stream PDF embedded font (sfnt) at offset 0x13631 17832 bytes