Malicious PDF — malware analysis report

Static analysis result for SHA-256 f892d0beae1a500d…

MALICIOUS

PDF

97.4 KB Created: 2021-08-25 09:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e2eeda8261b0dc45a3a0e7f7fda637f9 SHA-1: 40c97240cdfc64c6fa69a4038dd24bdf3705edb0 SHA-256: f892d0beae1a500d98053cb2c0e9e28c7ad82b672f33f4b25fee93a69e65ad28
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially compromised WordPress sites or disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs supports the classification of this file as a malicious document likely used to redirect users to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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://garglob.ru/uplcv?utm_term=finding+products+chemical+equations+calculator PDF link annotation
    • https://dineflon.com//files/vugonitoxakoj.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/10979713757.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/96876088070.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/64290066300.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79432105cd---kenegaruzidi.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/kigevosiselegeve.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/5acbef387f079c3a310d2a91ba3d15a4/navefa.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7f01d3e21---xirobewekukekofunibe.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095382a64b67---62143057690.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/pisetelekexa.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/70388879894.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608c88173809f---74228501311.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/85980972783.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/10452187458.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/4en5h33lm8npqa6vdqo3v346jp/gonajavifonip.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ca178f3c6---27322240158.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/mirosivubabidezur.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/4c3e2abff83d237e12f6ed2d4eccedfd/xekapijekupinopuzalu.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/64421203741.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/alnomiduc34lu6vp1rbdk5esjh/3166357433.pdfIn PDF document text
    • http://toonesk.com/upload/vifituletazodamug.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/17073455596.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771ca94f1b7---48878226964.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F19 17700 bytes
SHA-256: 36f1c001ad80995b5ab4380d047adfef5eef932461a97168451930ec076a2e75
font_02_sfnt_off00015de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DE1 11184 bytes
SHA-256: 0e099a7eca1b96ebdae3df98e6da355a3cd591e76987b2af106aa09fe7344ad4