Malicious PDF — malware analysis report

Static analysis result for SHA-256 453a89b81a7a7b98…

MALICIOUS

PDF

73.8 KB Created: 2021-07-01 23:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c698ad953dcf327bf3488bf39feb56de SHA-1: c4a293646b4625bda9472126b73ad2ff5120ae33 SHA-256: 453a89b81a7a7b9898e3cdbf1b9c2f4adaaa67e2934ce3e325f372dbe16ce665
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/brion0ov8qtl3mc06bp0eotuje/59032535254.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9239b9a8ed---lokunuk.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb5b6577c1---76504225856.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/45981559941.pdf
    • https://haidangpc.com/contents/files/rufibusetegivemivunato.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc2270ad07---tudefezages.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c71e618d3---bowisomadirixurun.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a458aa07201---zawiva.pdf
    • http://ecandrychow.pl/Image/files/75457221512.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/3888fe2083ace56fdf27ee7509520df1/40579534432.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/6f5cf92ea96a480791bfe4ae5836781b/98564620189.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0ecb9ebb9---11812673336.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5f9c92a5a---sedegoveluwabojovudisop.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a01a6f4721f---29772249342.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cd86542bf---nifolonivonirevej.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160850eb236969---jodorikofojubep.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/wevudedevutotapusimel.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d901a75d25b90168c7a4a94c52ca8957/gebivixetes.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/72565c715e366858070faad52a46beef/21019298998.pdf
    • https://schmitz.cz/res/file/3580345537.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bd59ea85a---88186299370.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=start+small+think+big+quote
    • 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_off0000bd8f.bin
807aaaa843703c865d7e993afe45d4b3a19c3c339047ba19e34ad2c645aabafa
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8F 16892 bytes
font_01_sfnt_off0000e8cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CC 16792 bytes
font_02_sfnt_off000100e3.bin
bb1cc56498e3f459fd6ae367942d5cee771bbb1b8c96b16d9a470ad18e4e5fe5
pdf-font-stream PDF embedded font (sfnt) at offset 0x100E3 11108 bytes