Malicious PDF — malware analysis report

Static analysis result for SHA-256 5170211928ca777a…

MALICIOUS

PDF

97.3 KB Created: 2021-07-03 19:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b37ac0ef55bc2320302a8df95cd42277 SHA-1: 4bdb5e8be114c4c3b1fe24488edd79d4b5a300d9 SHA-256: 5170211928ca777a09e646f47cdc7297434cb2499448b9944ba184b0ff379c32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing sites or further malware downloads. The presence of external URI heuristics and the detection of compromised CMS upload links further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://philabc.ru/uplcv?utm_term=errors+and+omissions+expected
    • https://coevent.ru/upload/files/76675364193.pdf
    • https://n-zvuk.ru/upload/file/63570721151.pdf
    • https://proxus.nl/file/10278251630.pdf
    • http://arohitourandtravels.com/userfiles/file/xafagegevapatapadopajoj.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/6d4217bc8ef862e37d43811da25f8af5/dukosorizatixanovoxeduw.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d13d165de9b443e7641b05c64906841f/vidaru.pdf
    • http://stin-verdon.fr/assets/Image//files/9868144636.pdf
    • http://beastyenergy.com/userfiles/file/56504680813.pdf
    • http://karpatskiles.ru/store/file/3664690845.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/f8a43697d0671834d38b81998528e3d8/xobazofotizobupipenefitad.pdf
    • http://bayanairag.com/uploads/userfiles/files/97673261654.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/59nkpq0jc6aacq9ao7hm7m0507/geponebikaguli.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/52f7abdbac5c761754e9ee1bb6c576fc/rutidazodafejojadonifofo.pdf
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/21638173756.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085d53d5634e---dugovigus.pdf
    • https://partnyor.az/userfiles/file/vivimoxunu.pdf
    • http://willismctyeire.com/clients/c/cd/cd1fd5262213d36872a77bd42df049b7/File/20609017172.pdf
    • http://cedule-plachty.cz/files/file/baforiragiserifur.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8abbf3986a---99638418515.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/ef3c1cabd87cb592f2a1dcf04c1f8840/67647529938.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ac414f7e763---26840724121.pdf
    • http://xboxheerlen.nl/userfiles/file/girutalepuvojiduboxuwoz.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086e89c7b30b---tukakos.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/f29b8fe558020f1a39352fa88105e552/fosizawipijobafolonokosu.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93116bfbf---gawosubel.pdf
    • 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
stream_003_off000102b4.bin
cf9838a6c6565d00fa3d37f43702a33f9275e13fb628b726a296ae1f81b9d9ec
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x102B4 26408 bytes
font_00_sfnt_off0000eaa3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA3 16792 bytes
font_02_sfnt_off0001322b.bin
a7a71c8335bb784d39231731e3660916bd10677e545c5b6cf6f1bbe944c8da14
pdf-font-stream PDF embedded font (sfnt) at offset 0x1322B 16960 bytes
font_03_sfnt_off00015e78.bin
2b04c8bf1f78da132a861e89dde79ac2ecf8e7bebf8b4b328284959526d1c9c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E78 10716 bytes