Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb5af5dd12e858d…

MALICIOUS

PDF

89.0 KB Created: 2021-07-16 17:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2096a5860045bfee480b4223142106b4 SHA-1: a7942ffc7752ae87395ff2d65985a670f442b2d2 SHA-256: 7cb5af5dd12e858d2e4b123251b0b887031dac19eb5eece980c9f00f6aabb318
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate this file is designed to host a collection of links, likely for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent.

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 https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/f9mt88crir4bible8vjhs9kq75/saxabezakevovarese.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/0889f9d2ec390677d54427d74f7a0a5b/12502979124.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a796e39f263---35385541839.pdf
    • https://nnkcreations.com/userfiles/file/buramufawekewo.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16096190a90e09---zebomegopikotum.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/26eb7873cf568faf987d6a595812df82/60250793588.pdf
    • https://angkortaxiservice.com/userfiles/file/16195963070.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5f105eb37---75089615458.pdf
    • http://hart-metale.pl/gimnazjum/userfiles/file/ruzajoduvirifavimamowip.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/03e35a898795ae47ef3270630bf0ff55/sipotigafirubesura.pdf
    • http://birzebbugastpetersfc.com/files/file/5428298442.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/375ebbb9aec2cb629fef9e2de8ee5a87/tadilatapagawerux.pdf
    • https://airshow-bg.com/file/joderudasumijilo.pdf
    • http://martonelektro.hu/files/file/zigan.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160abef0ac80d6---12693714510.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/07912e6cb4b5988af021cc1d854822d9/ledadimikujovadifiwag.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/monuxosawude.pdf
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/linaxelisilumiku.pdf
    • http://www.asslar.de/downloads/tedeb.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803040d9037---bagamobunovoviranovoxiti.pdf
    • http://asea-admin.com/_userfiles/file/20210512164706.pdf
    • http://onlineexpert.in/userfiles/file/34447513978.pdf
    • http://banglenhospital.com/UserFiles/File/4386097596.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/a944da8dfa4acf1d96a4b037a54f07e1/zezuponoji.pdf
    • http://benthanhsgfarm.com/images/uploads/files/44571161842.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=document+retention+policy+for+private+companies
    • 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_off0000f846.bin
a39d4c318b5dfef3d81ef9c3b24709f21204d515e64219d4b6ea6ce44fe916f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF846 17052 bytes
font_01_sfnt_off000124dd.bin
f2643ada919d627180d5d2098f2be194e845d00ee5b09c25f4184337a69ffa61
pdf-font-stream PDF embedded font (sfnt) at offset 0x124DD 10920 bytes
font_02_sfnt_off00013e30.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E30 16792 bytes