Malicious PDF — malware analysis report

Static analysis result for SHA-256 67150f36f62d6d2b…

MALICIOUS

PDF

78.7 KB Created: 2021-09-01 00:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 85bc50075e47670a6193af6e5f602f0b SHA-1: ae16b5f77916faadd15a03b43f08a8438528f075 SHA-256: 67150f36f62d6d2bf0ed141b510afb8ad79a4f900c39ddbb128092bbf822b644
176 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to compromised WordPress installations and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or to download further payloads. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic findings clearly point to a link farm designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://krisoc.ru/uplcv?utm_term=yoga+for+depression+sequence PDF link annotation
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/lavonikamebomopun.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/62960805858.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/kezelujuma.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/47584489841.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160820732d9c11---78509212804.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608319a324df2---21561011197.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7544f6cd20---46896821229.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611aa04840194---76622282679.pdfPDF link annotation
    • http://ebd.su/UFD/7623/files/monomovazajobimenuselenij.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/f46dedd486fb19595c72fd5575344bec/sawewusojafaniziwo.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083477232701---tarukogibone.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b381985d7---webesiputozutovutadu.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/lorulalututi.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/wexakenula.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/9b7af0a78f15b7ad573d1ebbd2697979/52509454531.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/fpherqpff36p0k6lb7kpqcaale/65897595779.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/30984672922.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/5823293534.pdfIn PDF document text
    • http://gysanya.com/upload/file/2108181821515088615mugovcya4bi.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/benepasojazale.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/sekiwidevenumufivisadomo.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/ba8d3b8b602475315e60b96b69927a51/5949529328.pdfIn PDF document text
    • 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_off0000ce79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE690 10880 bytes
SHA-256: 6f3cffa3f583e2bf2cdae4faedf2e6d170270dc20a765a05030278d6631c3dd3
font_02_sfnt_off0000ff47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF47 17388 bytes
SHA-256: 08c4661f56f5266daeb6d753a320653471b4e67a2ce2a4dbf37fb1e09b44b6f6

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