Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f0b8a66a609985…

MALICIOUS

PDF

85.3 KB Created: 2021-08-20 23:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 51ae30db8bd1e31f9c14a92c9979eb84 SHA-1: a2c5b14cef21d1f533e57dd4f0bce9f5263cc7de SHA-256: 82f0b8a66a60998549cecaa3c8e544447ce60780f762a5b6bfffe68d30046f61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and detection engine findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://sparkpro.lv/content/file/jedebivavi.pdf In PDF document text
    • http://superlitefan.com/uploads/files/wikugojunakegunisizuwu.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b45b23ede55---suwomazexivesomesadiwesuk.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd791e01f1---maxofojuxuje.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/19574034794.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/38484661067.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/eb1e96c96a5e6008a03d57905c7ac035/wudufawev.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/8335406838e813b3a52bd76d01da60fc/62633372203.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/8aabcdbd936d6b47d7b72550b8771802/wikemenoxizuzogigemo.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7b12db45c3---43632557913.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/borunugigoxaxu.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/mezurusijoz.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/16674045328.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/koruvo.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/53178064662.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/81513568994.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/potetewenulivuju.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/naduniwuze.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/24589962349.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/59226922594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+send+money+via+western+union+in+south+africaPDF 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_off0000e74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74C 17448 bytes
SHA-256: 9e65cb25906f7a4234c14354963085d20902b506351d35c896bc9b782e6eac74
font_01_sfnt_off0001154d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154D 11052 bytes
SHA-256: 5ae36b7b0ba7672e09aa428595e62281eb738e12023ae4311dd6760522ed847d
font_02_sfnt_off00012ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1