Malicious PDF — malware analysis report

Static analysis result for SHA-256 51117623f0e878e9…

MALICIOUS

PDF

74.0 KB Created: 2021-07-02 19:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dde63454f9286d61afcaf3d71e9297f5 SHA-1: 6c2809559aea7d09049745efb8032527860b36b0 SHA-256: 51117623f0e878e9dd1a6fb9519fd7643cf2c29511531fd94ed792b229f1e8e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators confirms the document's purpose is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=if+you+get+demoted+can+they+lower+your+pay
    • http://safaraval.com/basefile/safaravalcom/files/87491529307.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a45efdb0598---soletatosaguxajipive.pdf
    • http://afgventuregroup.com/cfiles/file/13113132278.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/17259f0402e2fa2f4ad2b20bfd30b5ae/kikepexilurixojobojoniwi.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ea2b4e263---1834662018.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/d9378c776dd7d755fb5e6d691dda1ba9/pekefitojasugowak.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/8gbgfsaq5qpgagd8h3jat205l3/rinirujal.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16074febb78ae3---mowagolovekazaze.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607653e8848d2---22114503423.pdf
    • http://embeddedhr.com/ckfinder/userfiles/files/88831979732.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/76982299468.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086b6c023ef5---wudebuvepaza.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/5e1d12debdc3ecc6bd068531f58de7d6/lalujapaxug.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/gl35h6ovmv052f81tc22svluag/78702229471.pdf
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210623_068A7FC011891479.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16081380cc70ef---nobepoxedasixafupanagom.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/71c008f01bfc51771f3eecff13722a2b/27314172830.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16092f1d4483ba---foruzodise.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/f4tu4ujuuhgmniboqdfgpquta1/70287778657.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608558fa255a3---xegopuzabisiguzovomuxapog.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/rj0ujo2mjs70058o1g2toms3g1/saxak.pdf
    • https://store-connector.com/_upload_bilder/_filemanager/file/90972064146.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/fe555c059f055335720672f385a22fc8/6084277610.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/398249371d8392beaa14922f017e70cc/27102457239.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_off0000be9a.bin
a4ae48a40fae6764d70bff292a8548f7255daa0ba121956d28abc498e5c5618e
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE9A 11060 bytes
font_01_sfnt_off0000d801.bin
3c6b1cf95d1d469592f156e0076ff31fa99d43c75aa16dfd356611285576c61d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD801 16312 bytes
font_02_sfnt_off00010243.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10243 16792 bytes