Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb7f7f0e1c88638…

MALICIOUS

PDF

84.3 KB Created: 2021-07-02 22:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ecfd56c0bb1b865154f885edb33b4a3 SHA-1: fac34354152de725a84cfdfd0e9b5a6d9ed1e8d7 SHA-256: fbb7f7f0e1c886388daf55de5aff9865632b2b5db401742ba622ed0986f01bd4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, but the overall structure and heuristic firings point to a malicious document intended to lead users to external, untrusted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://kemenyseprosiklos.hu/upload/file/lulosuxa.pdf
    • https://www.carrentchiengmai.com/files/getifeviwebudariwolajeva.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6adbc08ec---miviwukobotojo.pdf
    • http://anatolianlgs.com/userfiles/file/ninulategonopavesigedug.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/848a4f5b7352b767b1ed866e44a8524f/50448005307.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/0ac23ae83ff9411ae3f133212d4bca15/27744652358.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/5u1kssupqkotpn8n2u2fb3vdc0/62248820707.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcf2312e9a---84784789416.pdf
    • http://brlairport.com/images/file/24312722454.pdf
    • https://alarrabnews.com/images/content/content/file/46792770491.pdf
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/tekiv.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/3277a9b490fb2742da087b9ca7727d76/xolujagat.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608103842badd---17538679776.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607280419cf3d---lutogazezukakilukak.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/6a65bmdh2mjkk8t4b4v86qk43j/22023754644.pdf
    • https://arte-salon.ru/upload_picture/65829789789.pdf
    • http://lovesushiscv.com/uploads/files/zagudi.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/35121360056.pdf
    • https://contabil-fiscal.ro/mm/file/14810200360.pdf
    • http://bakoca.hu/files/file/zadumos.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a983e1f01---filobadamilasajerititabul.pdf
    • http://twothirdsmajority.us/clients/38522/File/mugupajaxenozufi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=airpods+android+app+apk
    • 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_off0000e4b3.bin
c3e5686762366c54b32fc4057e701a579610691bec4d9995a5114e1259017691
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B3 18532 bytes
font_01_sfnt_off00011404.bin
edbf3cea784478c07eb227a536327d25f0a12f7db3db45dbd2226b3af733af8b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11404 10184 bytes
font_02_sfnt_off00012adc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADC 16792 bytes