Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea8ada097b6b47e…

MALICIOUS

PDF

99.9 KB Created: 2021-06-29 01:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d40303958788ff15cb1d32659f6309b SHA-1: a487398b015ab3dff071171b0d9a599ec33f8af0 SHA-256: fea8ada097b6b47e70dcc6851b7248d4ab64d975b1ff1970669d062762eb16fb
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a link farm used for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/da5e9088b22919fd2c0dbd20f9199222/bokuzexobiwosozuwubu.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fc202948a---pijur.pdf
    • http://www.lugashotel.com/data/editorfile/bobibizerozumuzolubazos.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/pnv11nrqghv30lha2jmfmccja3/50273968397.pdf
    • http://kalikraft.com/images/file/26761736346.pdf
    • http://eko-inwest.eu/upload/file/91593859103.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/b09ss78p7oqu81lff7su1vaao2/7169865941.pdf
    • http://marketypik.pl/zdjecia/fck/file/4824194091.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80d2a2635d---bodibupefukikep.pdf
    • https://panificiopasticceriabattaglia.it/file/bidepegazipubejezofube.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16071ade642712---43621417265.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/628d54f89d3e5de3b9930260f743471e/1504606331.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/rozulokopa.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073e874e977f---morazeb.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/8148411e36639b50e05a7f50d0853e73/xutizewoziwejalutovabef.pdf
    • http://adaviestransportltd.com/userfiles/file/musigadija.pdf
    • http://osoboebludo.com/ckfinder/userfiles/files/fawunerezinarulefarorib.pdf
    • https://szud94.hu/img/sajatfile/files/29539998733.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f41ab58d2---jubedoje.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/im40or2pm9uhjemnbmemqkss75/5339994967.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/7b87519f3b531438d34de2e9a2bba15b/balebujurujili.pdf
    • http://dush-kz.ru/uploads/fck/file/76250860558.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090e4fda816f---wevew.pdf
    • https://istanbulbalbir.com/upload/ckfinder/files/1992055643.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa5e351d63---wejolovatode.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=spud+exit+pursued+by+a+bear+pdf+free+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7e9.bin
8554b52416975ffb8baee07f46831deafa66c699d6439ee6400653273f572dca
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E9 17096 bytes
font_01_sfnt_off0001011d.bin
2516413513160f0e3d9bf3471bfdf474a465ca2de5d977dbde9bbde7a8d46e5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1011D 34044 bytes
font_02_sfnt_off00014f7b.bin
29bdb015c6a2e87eb1b4836c88c81c96f7d9cab1a81805b5c7f062fa72e2db8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F7B 11108 bytes
font_03_sfnt_off00016965.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16965 16792 bytes