Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a863a28e7a64c2d…

MALICIOUS

PDF

76.6 KB Created: 2021-06-26 07:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7e855760b05eb4527af2b5ab28664e2 SHA-1: a411d35b03c2b153bd4c2f02fcf4b947d907c0b3 SHA-256: 8a863a28e7a64c2dc0b833b2465853499a61fea80f642a3f2db87674b09d5025
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or conduct phishing. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern. No scripts were extracted, but the overall structure indicates a malicious intent to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://philabc.ru/uplcv?utm_term=it+is+a+precision+measuring+instrument+used+to+measure+the+inside+outside+diameter+as+well+as+depth+of+hole+and+slot
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609304b23e645---jezed.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607446ec2e2cc---sufamuditinibukosowu.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/7c1e1291964b7f0e7c97ed5b8855ad27/razezel.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9fc036b78---45572626401.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/bfc9e5de9ffbfdb0996c5992b5295207/77769183854.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815f872fa96---13859943958.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/69302ba06a4e3082e5f137a0c2795837/5647577029.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ec4f418a5---mofobogo.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8a7d0b26f---rodat.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a830c8979---64950912623.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cecb90234---87841690769.pdf
    • http://ifa-astrologie.de/userfiles/file/35066516274.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/dd6vl3nmlujhnu0qjeioob2dlo/31881024120.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb6d094d99---90564001383.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/55cae62df478f617b38fb35dc6664eed/tadokinowopiw.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/5f7d28acebc628d3de652bf71e5611a8/58507183779.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d3c58b74d---38962719291.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091707d0a6d0---zubupuruxilesotamovi.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/fcuut5pjqd7tl4vrt7fleg47q7/guwipebodijutawogig.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11160d523f---pufalokiwisixiker.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3aeb9f3eb---44431014229.pdf
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/42094534725.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/b3cd2410ad44127b04df5ffbd0287b4b/jibizawutoragawotupanu.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_off0000c6df.bin
edc323eddbf08396f15460847920b348f687ee814e287fc96cf6b1973132c007		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DF 11204 bytes
font_01_sfnt_off0000e0bc.bin
6e637bbb08a81ebc2bd57ef543b27a8b811d75ad2d62e1fa8ee5dce3aec66f34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BC 16440 bytes
font_02_sfnt_off00010b3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3C 16792 bytes

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