Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e73c02372eb22f8…

MALICIOUS

PDF

89.4 KB Created: 2021-09-05 22:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c7b1770a8f2abfe696d9dd0bb623a96b SHA-1: 41dfae5eb3e07e26d8083ade9a1501898a6e1e93 SHA-256: 7e73c02372eb22f8a11133775bdca1630e481f76b8dac440dcf85b8636e2ef39
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. While no scripts were extracted, the structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://salespate.com/userfiles/file/nonojodovixovoru.pdf
    • http://fitsiluet.cz/data/file/90506892058.pdf
    • https://aihr-iadh.org/uploads/FCK_files/file/dakajitiwa.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160da951e0030a---sibivemeg.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ih0ofc3eqn34opqs626ap2b1cv/34237601123.pdf
    • http://novichiha.ru/pic/file/mesubak.pdf
    • http://kinocosmik.ru/sadm_files/7370954379.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160902270a6de9---32417577582.pdf
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nowobijot.pdf
    • https://ibericadearmerias.com/file/50704435302.pdf
    • http://dlt-nkp.com/fileupload//file/vibukafakawivelajuge.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869a5aef21c---82369700026.pdf
    • https://ip-pharma.net/data/files/sexemefed.pdf
    • http://szwygs.com/upload/52040445161.pdf
    • http://kimandyoo.com/userfiles/file/borokoxizifowutakoduruki.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e83701459c---mupexide.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d7ac400947f41ae576d3cf226ab8193d/mazipunoj.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/fadafff3feffc39340b5eb9f492a3aba/32555146122.pdf
    • https://serwisnawigacji.pl/userfiles/file/67573161693.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160943274e4820---lijinaxukunafusobazotas.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f682f1b8150b487df0e6d139a01a174f/27545892805.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/318dcae4443848c7bafae5f2c0a2b19e/xegewu.pdf
    • https://vokalensemble-vocembalo.ch/userfiles/file/92072884749.pdf
    • http://bassbasement.org/userfiles/file/99764607555.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=sponge+iron+making+process+rotary+kiln+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_off0000f630.bin
7fdf3a013967a1a0232ed582514ed92e837ddde068740fd123c279562e244fff
pdf-font-stream PDF embedded font (sfnt) at offset 0xF630 18120 bytes
font_01_sfnt_off00012588.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12588 16792 bytes
font_02_sfnt_off00013d9f.bin
3e287377d763eeaf1f6fcf029e9a4f4c8b54397f4886951c36176c3f20f90bdd
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9F 11244 bytes