Malicious PDF — malware analysis report

Static analysis result for SHA-256 f826bdddfde4e6d6…

MALICIOUS

PDF

90.4 KB Created: 2021-06-27 10:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 471fb1cbb11036ec159379950e7b01b2 SHA-1: 66506752d2df75f61e901bd8da5c56f5dbe0ed7a SHA-256: f826bdddfde4e6d601ca1362591ae11237b4491b40d737bab10c91fc5acad096
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 numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://philabc.ru/uplcv?utm_term=touch+wood+meaning+in+english
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/6783629921.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16095becdcbba7---29613475701.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/lt646hsinhu8p07g2coea3s2v0/60294694577.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/rqqd7hc7fa27m7b7ji9ns76j1u/19965939400.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/dc736f74d2321a0dd0155e3da6ecaeb1/54975978480.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee5e48215c---juwatedakidasobo.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/ccb3c226fe76872e554f547e3b548061/xulif.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607125d056596---53309325731.pdf
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/selifirafosufawerowevo.pdf
    • https://osikovo.eu/webroot/img/content/files/97444656047.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/34hvnnt8f6d1q6d3lkbvdi5v62/62090009781.pdf
    • https://bursakaynak.net/userfiles/file/72909579463.pdf
    • https://nanyangtextile.com/userfiles/file/voxosujuri.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/soporalaja.pdf
    • http://sklepjola.pl/userfiles/file/99847030171.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e57d67873b---16404428889.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/86f1b8aed9113a55c3c93e1843a7fab0/sulejuvamufazure.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/0c22bfb9416655d31f6b6b059a4a4eb4/zixote.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c85127dfaee---90621246071.pdf
    • http://chithanhplastics.com/uploads/userfiles/file/13548414956.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf8cd3ecca---82211179263.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39f22b42d7---rugodasesavifisufi.pdf
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/19534848474.pdf
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/472u949qi8pbh4olmairk5nq7r/29830185216.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8e4a70351---vofiker.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608490a031329---sufulosotefito.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012b12.bin
29b446361d7780dfeb1dcd8598c5d0406bba79ba4c7855fa59a411f5f6d89e95		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12B12 16468 bytes
font_00_sfnt_off0000e0e4.bin
7e3cc903f27e87c1414c81ce2c064def34204b8ffd9571c189a4d61e9a8703c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E4 10768 bytes
font_01_sfnt_off0000f94a.bin
15c3f519eaf5542c485fbed399290978446e3533c1c435e67c56cba8f9ff8a34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF94A 18756 bytes
font_03_sfnt_off000141e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141E9 16792 bytes

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