Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c10b3523aeb9e59…

MALICIOUS

PDF

85.7 KB Created: 2021-07-20 12:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3ba38df4530e211dcdc302b904e379f SHA-1: 80a6749069705a144cf647c853c33a307607aef9 SHA-256: 8c10b3523aeb9e5993b8f4f94bab5410f5efe269db37f59b376cf9f9500f6549
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute or redirect to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719ada786bc---jerixixikirokuvogake.pdf
    • http://arcomproltd.com/userfiles/file/nipowiz.pdf
    • http://homenet-spb.ru/userfiles/file/tarizo.pdf
    • https://branchennachweis.eu/userfiles/file/1880078657.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b85ee320d51---60177254836.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/1338b5d45062e5c9bd6c210755905ff3/lizulakeg.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9ac85da3fb---89228982426.pdf
    • http://trustarshida.co/cache/fck_files/file/43537973005.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1c9d4e9f61e9860d81886f4e05a33589/92222365705.pdf
    • https://biomedchita.ru/imeg_master/file/texogixiziguzo.pdf
    • http://bogelaipigeon.com/upload/file/57906492427.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f271071c5d---zafewikevikatixajotux.pdf
    • http://waterreducer.cn/d/files/20963740885.pdf
    • https://bataretak.com/img/files/file/62872840575.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a045e45ebef---91037863357.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/53770cb4972d2abf6b7ec353d2f03b07/tugagizibesixoza.pdf
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nonene.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084d179d6bb4---14708026124.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/25dr4ig512rkh6es6blrqq5s2q/jatelaxovi.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/b188d685035b7b9e27c9950505d6f53f/tugavotiwomakatopafelud.pdf
    • http://amadpich.com/userfiles/file/4730634948.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/46773240363.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078bb03901db---diwamun.pdf
    • https://aimhc.com/userfiles/file/31350699896.pdf
    • https://pmcp-avac.com/files/upload-ckfinder/files/59966005208.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=what+is+the+square+root+of+negative+48
    • 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_off0000eb8b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8B 16792 bytes
font_01_sfnt_off000103a2.bin
4c79978ac11863004aac8483c81cd109abd0bbd35e14632af80297cd9c521308
pdf-font-stream PDF embedded font (sfnt) at offset 0x103A2 11036 bytes
font_02_sfnt_off00011d18.bin
894c26b6c32998e9193e23ed73892331eee35542a896a5724459c3fa57c0b2cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D18 17056 bytes