Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fad1199dbf39140…

MALICIOUS

PDF

82.7 KB Created: 2021-09-16 07:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 902f5e89094278f1bf402aea1d1d8c72 SHA-1: e4dc3e79fbec8bf032b59539700e81b3f63e8bce SHA-256: 3fad1199dbf39140989af0d1c8ba4f8cdd0fec19e5690cdeb53fb08ec052d262
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress sites and disposable hosting domains. The embedded URLs, such as 'https://infrive.ru/uplcv?utm_term=tekken+7+android+apk', likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=tekken+7+android+apk PDF link annotation
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/e13db616cbf09a1fc40961bccaea5364/midigotaxazipekemulegavo.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/sazalajuj.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/7b748bfb21c81fc4d5993c671283e589/xuzatawanipalejaruxawiva.pdfIn PDF document text
    • https://contabilidadegoncalves.com/fotosempresa/files/fojisuwotomel.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/30744543124.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/15453770147.pdfIn PDF document text
    • http://benetalent.com/upload/files/73221175458.pdfIn PDF document text
    • https://adikkedua.com/contents/files/litipipe.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/kewegibizeripezaxul.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325f5c6b05d---vanimogigupavexegufazuti.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/36513392224.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/40082370313.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/regefunujumujufonevefowa.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/gularazax.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/88683707514.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/dadutogek.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/sumoxepetijekoba.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/xabal.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/sovoliwegepuded.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/de75e287e479b49abd2d923df5134cbf/barupasapataxobulaveg.pdfIn PDF document text
    • http://strahyi.ru/images/file/7439807353.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428865a6b9b---64643919937.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/kowapagerat.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/2579521730.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_off0000e03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03D 10176 bytes
SHA-256: e61e1ed0f292e22ec11b32faa9e4b3d2e6a5d6041b2c2b5a41525c704ae2adf9
font_01_sfnt_off0000f71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71A 17872 bytes
SHA-256: 33d29b0588c55766f5ca255adaedb63947d88eba69b584ae97828d0b4cad1575
font_02_sfnt_off00012505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12505 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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