Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d962cab5b1c9613…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 15:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2529aba4ca5166f135de18065dc9cf92 SHA-1: 039a68069faba5b550b0cf0dba086122e5c21201 SHA-256: 1d962cab5b1c9613f87b311671440e27e99a93a7dd09398514fe720b4a270128
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://gorisum.net/fckeditor/upload_file/file/zolarapojagaraxa.pdf
    • https://rubin2000-distribuitorshop.ro/userfiles/file/93426040408.pdf
    • https://bawwabatrizq.com/userfiles/file/40963053566.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd6ef192b5---kexozozun.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/dd243174ec36f3aea8e403743f9ffeac/64047581399.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/a26ea4cb1e82a5ea1aa6492417206f36/32662284831.pdf
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/fovobusatatevile.pdf
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/2955912720.pdf
    • https://adian.eus/files/galeria/files/kolusa.pdf
    • http://st-ark.it/userfiles/files/zaleminapifona.pdf
    • https://blsautomation.com/ckfinder/userfiles/files/duwiwu.pdf
    • http://portalinmobiliario24.com/uploades/fckeditorfile/suparofe.pdf
    • http://nutronicltd.com/userfiles/file/vobidebimowuwerisobolikas.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608357cd19d56---36704364171.pdf
    • http://wallsfamilyreunion.com/clients/876683/File/32223282057.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/bujumokuxezejovesoruzovin.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612aa3674cba6---52298270860.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafa1ec586c---84731324244.pdf
    • http://usaoxin.com/userfiles/2021-8/file/99106041104.pdf
    • http://manisafar.com/basefile/marcosafarir/files/96139643526.pdf
    • https://barcelonacentremedic.cat/files/galeria/files/82798274139.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=alimentos+baixo+indice+glicemico+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_off0000da45.bin
81d79a0e20599d94d8f07798a78953ecd176acb76c3c9cae25be94d6d5114f18
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA45 11084 bytes
font_01_sfnt_off0000f3c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 16792 bytes
font_02_sfnt_off00010bd2.bin
e815ad8c4ad806d22d4c2493defd053744ec25f3a6ee0cd0d5d20a9faddc156c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD2 19372 bytes