Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac200e210976108…

MALICIOUS

PDF

86.6 KB Created: 2021-07-17 17:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e82d07300c9011ee3a49095e755326f6 SHA-1: dbb9cce276251a2e5af2a90bab9a74a225d372bd SHA-256: 3ac200e210976108c011df34cfe3c9452bcd10c3c031f368f48e4323864a9cd2
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristic firings and numerous URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://xn--xhq021fvrwdth.com/d/files/vazojemurowifizimovubugu.pdf In PDF document text
    • https://asiarsolutions.com/userfiles/file/disomibopakozigede.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210502110647.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/fubezedagugomilikaxim.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/pitedago.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607478ac5673f---rizokoberata.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106240338162167.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/72f58868d9470c7e44888d47c5de27c4/24984278952.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8ad5de37d---65498822240.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/be583ab614717b475c13d68d76b6dd4f/wezumo.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/tepog.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/zapudizusenokumopinof.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/noxilebexizaleroda.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160d9793dd0815---54258722719.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/figebumovomu.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/s28de9k3u7nurqdigfea4jfdk0/46210727374.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/e4b4c765a4fc41c919194a657f5de642/34920646358.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d383a672b09---jukaw.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/bgpofok4q3te6tkit39ajbp8k6/jibuvanavurago.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/r5ear8egcnms7jjlap0qtb6g72/bamed.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/vujifesezujiperuwela.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/fuvodoguwavev.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb4b560c31---99417137848.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/73087990003.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/26036039281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=modified+euler%27s+formula+is+also+known+asPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1A 10724 bytes
SHA-256: 41a40cba1093f1c7b1549e0fa782e545e0b383025308474db8153da4d26c1cf5
font_01_sfnt_off000106cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CD 17392 bytes
SHA-256: cd3597a987806325c67f139f31682861775484fe9d1761b481ef9554ee15200b
font_02_sfnt_off0001349f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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