Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbdc80ec6fad5d14…

MALICIOUS

PDF

85.4 KB Created: 2021-07-01 10:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73ded7788430fdd55da95dceca624fc9 SHA-1: c40e7db7b8ef522dfb1206b1467211b4b1460804 SHA-256: dbdc80ec6fad5d142a44fa9200ca8b169449be4e906ed95e974222692353f2ed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a strong likelihood of this document being used as part of a link farm or phishing campaign. The embedded JavaScript, while not fully analyzed due to obfuscation, likely contributes to the malicious functionality by redirecting users or executing further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.benyowsky.com/resources/files/37040395030.pdf
    • https://tezerwatch.com/file/upload/files/07-01-07-07-00-57.pdf
    • http://www.chatanakonci.cz/userfiles/file/pezirurogidofurudi.pdf
    • http://gptools.net/userfiles/file/55830638768.pdf
    • http://scandirent-new.ru/uploads/assets/file/gupixusepasajinudezam.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be71606fec1---29845301547.pdf
    • https://deltarealestate-eg.com/userfiles/file/24784558132.pdf
    • https://octvads.site/js/ckfinder/userfiles/files/23963590454.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096462f818ca---nozulepotoletitozosu.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/l16nm2a2sknd4me2v1q9c0j564/18953612962.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/v87c43pjs9277oh07rp91pp3s4/bovef.pdf
    • http://olgapolyakova.com/files/files/55464931890.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/b549598ff74201631677b51ac67a826d/buvatimeb.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071c8ff1abaa---39555003700.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/7de23d08207eac2724e3f262418627f0/8937167157.pdf
    • http://pogservice.ru/userfiles/file/61416191200.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc1785cc38---11210097747.pdf
    • http://clinicaveterinariamontecchia.com/userfiles/files/ludasujevudikavuwafukis.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c259874704e---kolidokuvijodi.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d3258e9a38c---pidurudotukavomiridom.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a191e1d2f4---58021891862.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/29135534436.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c839154dad---62001653119.pdf
    • https://musikkursus.dk/userfiles/file/jogunen.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/rueidijuoj5d35bu1rdmkal80f/20637499733.pdf
    • http://bagumul.com/file_upload/spaw_upload/file/20210630195330.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+find+answers+to+math+worksheets
    • 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_off0000eaa4.bin
e8c34eba3df7b2c924abab6b7bb6d1526785435dbe20d57e58e6b0ec7f0049b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA4 10740 bytes
font_01_sfnt_off00010322.bin
0ec08bfafd2e1683da6518000f716ce031b9687ab044c395edfec281e785987e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10322 17240 bytes
font_02_sfnt_off00013045.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13045 16792 bytes