Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50633e24324320f…

MALICIOUS

PDF

84.6 KB Created: 2021-07-16 11:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94ac5eefeceb135c9a2d8b6bb32ed2c4 SHA-1: f971c409f8ab636880c6b681789f148621adc3ec SHA-256: b50633e24324320fbc288acc3968786bc3066b2bd9f4509b7d3f71285b7a950a
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links to potentially compromised or disposable hosting sites, suggesting a link farm designed to host malicious files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. The 'SE_CALLBACK_LURE' heuristic further suggests a phishing or scam pretext. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://bannermaul.com/userData/board/file/besulogunazenogisibarovuj.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160836be8b2410---tusokogerezipeg.pdf
    • https://samudra99.com/contents//files/bigigevomogefepol.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51c55d729d---99007037959.pdf
    • http://skpizzasubs.com/uploads/files/38469984368.pdf
    • https://etimes.mn/uploads/files/rakumipulepolugejavefov.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c057ab584ff---zesusuxot.pdf
    • http://sun-tes.ru/files/file/senanubimogoro.pdf
    • https://smartcirclegroup.com/userfiles/file/dejusugemepufoxuv.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed831b961d---20650577427.pdf
    • https://nezrenpin.com/calisma2/files/uploads/53105781997.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/72cd6ff284fc158089dd5d76ab59fa47/wofumojokajar.pdf
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/xebixomugafasub.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/a3f38e55d02bdda307ee8e63de601ebb/83838752273.pdf
    • http://adamlegal.com/userfiles/file/fimivetol.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0eaa3ab50---kaxenilurefufuked.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/7e1ea6ed4a11e083e9f3ca90126675da/96189941359.pdf
    • https://taevlingar.se/images/pages/file/deguramarizutalemalu.pdf
    • http://gd-weimi.com/upfolder/e/files/20210614211929.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/uf62umull8u84ldu025iorvm9l/juzutirinavanevufinote.pdf
    • https://tvsporedi.si/vsebina/wefemuziwoti.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b06d2ce8142---muxemol.pdf
    • https://n-zvuk.ru/upload/file/rarezi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=shaw+library+opening+times
    • 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_off0000e603.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE603 16792 bytes
font_01_sfnt_off0000fe1a.bin
a8979dcd606020a9c2e43f9c6c5fcc72da820cf77890a1e60f7e2836d382d255
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1A 11112 bytes
font_02_sfnt_off000117b0.bin
10c9e6e09f04e962483283b8e33c5e8555619a48716ce3d8b619ebaf1febd14b
pdf-font-stream PDF embedded font (sfnt) at offset 0x117B0 17280 bytes