Malicious PDF — malware analysis report

Static analysis result for SHA-256 175b9da15736c572…

MALICIOUS

PDF

95.2 KB Created: 2021-06-27 14:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 421eca3461108b33e37109f76c52e259 SHA-1: 25fe246924ddb2320ff9d5c8cc1b0180083ec043 SHA-256: 175b9da15736c572dba78574ff42267ad0d43cf91c968b1bac91ee3f346e6ae9
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://feriaalainversa.com/uploaded/files/lefotigifepufune.pdf
    • http://epmachine.ru/d/files/kovotalisu.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d438acab28---vexagipovixases.pdf
    • https://sambelteri.com/contents//files/kosibokufofasewof.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4f5d5c67a---99724654921.pdf
    • https://bevelec.com/bevelec/dossierMois/file/xotelor.pdf
    • http://ekotop.eu/userfiles/file/bijajome.pdf
    • https://alakharia.com/public_html/userfiles/file/zelifumusodoralosom.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/eab3989b016f7d62f0b96853260ee72d/vodikotefa.pdf
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/sonerolejobuwuwara.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/tc24o5sig308tl3ath4qaqc89v/93522086385.pdf
    • https://cornerstonelaw.eu/userfiles//file/pikusevovozosixomipan.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/1bcd75ff0bb02d7fbc1da49f576c4a17/nilawi.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947a51f1962---fibitekibido.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cdc283e0c---jireverefuvatajad.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/37meev3s93b18hpesch0nn0kf4/39211380261.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16074d34813f7d---37492277604.pdf
    • https://bataretak.com/img/files/file/luzuzasakesudenor.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a50b2042020---lazuxomekujidobekup.pdf
    • http://cuacuontoanthang.com/media/file/29843235970.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/76516611ff55d679741afdeb04948c22/pevemafonabugor.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/qke3522cqflio8do7nrod44qk1/74787404461.pdf
    • http://icltindia.in/userfiles/file/lamujijitowewujatepe.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b38582e837---47821845038.pdf
    • https://aprilboya.com/userfiles/file/78728158868.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=single+time+series+design
    • 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_off00011414.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11414 16792 bytes
font_01_sfnt_off00012c2b.bin
053fa55dacdb217631536b0a1b44b8da712baf83da5616aefb7f27a7bb91a9ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2B 10384 bytes
font_02_sfnt_off00014356.bin
9b961c3749699bf6be1f68527a6ab777e9c084b5405128259e6d2e8623619777
pdf-font-stream PDF embedded font (sfnt) at offset 0x14356 16944 bytes