Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f10e5bddea89a7…

MALICIOUS

PDF

113.5 KB Created: 2021-06-28 22:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12db5b2619a490b733474b9920107ea4 SHA-1: d22929e98b3c9aeee4ab21b95f3ff704458b208d SHA-256: f0f10e5bddea89a739941237b3d75e3df122b4710c7135cee7b3df3770badba9
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://abpaluso.com/upload/file/zuwefododutitanijawag.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913d085afa5---4862993501.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/90c321bb9d1369dbe0b94a23d6a1ea5e/42875012374.pdf
    • http://abimobiliare.pl/pliki/File/xufinanuxurapep.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b398c7ceaa6---zeboxapivaxipevuvo.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/34771015557192685aa65d1277d5b540/gewidefaxibefu.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/2e53b0017269df161a4fa0f9c28f3c50/90204820126.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/53bb121ea40c512b2ff6bfcac778d9da/77235417335.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edec7a5b13---zavojerobibesu.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/8fd4b13b3f9ecc9b768655c867a16a4d/nuwofukexesad.pdf
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/webidula.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/9ce34af2c70e4f7a49f7f37625de8420/wixilavibimunojeret.pdf
    • http://urgentcarepb.net/userfiles/file/warelepowanaber.pdf
    • http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/80735616065.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6b137375---42322611289.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d419278b8bba5933411574e2475850b5/nadijavamege.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/savaselalulejoraxozikuxe.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae1691fe8f---fakixebaxodutubono.pdf
    • https://unibel.pl/pliki/upload/file/rozemuxulariwenaxanepu.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/14ac81e94a9122b410a8ce3300a7b522/40136690583.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/df62c68d172efcbeffff83e68630f3c0/78159399541.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=derive+the+lm+curve
    • 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_off00015d5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D5F 16792 bytes
font_01_sfnt_off00017571.bin
0c1bf9e8e89fc7fd9f36cd81d2e347fbe919a49dfab9250a45bc6ad32f1dfa58
pdf-font-stream PDF embedded font (sfnt) at offset 0x17571 17396 bytes
font_02_sfnt_off0001a316.bin
e2e37accc6026097a9fff12badd32cf13c13ab5208acd55b97a4276c90080169
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A316 10108 bytes