Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b04a33e4e275f2…

MALICIOUS

PDF

96.4 KB Created: 2021-06-29 04:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b211b2ae184088a465545c2dc971790 SHA-1: b86ddf99485d4cca9ce7189e670c2ff52166f86d SHA-256: 13b04a33e4e275f21aa9b952f48ca39fd53ce5280422046eb467336f6e78fe56
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates an attempt to track user engagement with these lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=lotto+result+today+2pm
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/ba7e997f9e52b46efd3d8f4d653d64f3/kitaranatezugumi.pdf
    • https://suativisamsungtaihanoi.net/upload/files/debalaridewurokikoz.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e98e3da20---66807750030.pdf
    • http://asfus.net/virgsurv/userfiles/file/mozusawafumeside.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af0ed37931---45431957529.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd7e26529a---pemilumuporuden.pdf
    • https://triptoboloyfoundation.org/editorsfiles/files/91832483331.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2bab7eb15---65277789837.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8a3ba92ac---44474087146.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608510b0eed23---51972291335.pdf
    • http://chromatographvials.com/d/files/29989110756.pdf
    • http://bakoca.hu/files/file/mareniresunagimuvezedep.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/1f27a94f63717bb48ec381ce39a12a7a/bamuzegalomago.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087b550d4116---bekozawirupilaxa.pdf
    • http://kursadowicz.pl/Upload/file/47934191296.pdf
    • http://stacjaregeneracja.pl/userfiles/file/mozenip.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/0c94e211c88405c634d99d1493e4227c/83327331049.pdf
    • http://maychamsocda.vn/images/userfiles/file/56452987276.pdf
    • https://aulacvn.com/upload/fck/file/24377306549.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/7631755fa1bfd5dd1b609edf3e9ec8a0/47625787727.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48381e1eca---17563856254.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/65e1208977d3728f9f0fbd1963e9d2c9/zoliguxitigazisutikusezi.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/4aed6b0b9a8392e25fab70bd0f868d31/besematesumixeb.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/74dd94f0dd19110ee1cc69a76546ef8d/48385977563.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/e89267a57891996a03e0840af1d43b84/28465557589.pdf
    • http://montaze.org/democms/userfiles/file/wazinaxisaji.pdf
    • https://abandassociates.com/ckfinder/userfiles/files/8638321170.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115C6 16792 bytes
font_01_sfnt_off00012ddd.bin
416cae965f4a664e20ac61dd5645f733740bbc63b4d84fccd20a39efbe93b65a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDD 10648 bytes
font_02_sfnt_off0001466c.bin
15742c0094286d06d3e0716765b27dffcf8e1bd5ce1dd5f645515e534a585ba8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1466C 17432 bytes

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