Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad59a6aab3b66ca…

MALICIOUS

PDF

93.6 KB Created: 2021-08-26 01:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0b8efa48279b4f5128cbbf62e8568105 SHA-1: 205b59b19e3cdb7c6f30fb6a23615907e236a17e SHA-256: cad59a6aab3b66ca11ce83848b976642eeb002452b3197415fbea1e651ea9091
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_CALLBACK_LURE' suggests the document is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were explicitly extracted, the presence of numerous links to potentially compromised WordPress upload directories and disposable hosting points to a distribution mechanism for malicious content, likely involving a callback lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a3b398d4e---nuvanupe.pdf In PDF document text
    • http://www.urbanwaterways.info/files/67101473006.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7866a7d54---88645998275.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/zujoxaxuvunusoropamidufo.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608877d2efdcd---79142836735.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3avesngho8hcqqtftd0efs85j7/pokakukokawilulexo.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/xebidawuditoramiwar.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0204949001620786690.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210801114331_ans3o5.pdfIn PDF document text
    • http://hochrainer-elsner.at/upload/files/20597918420.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/39723865492.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf41170218---7324395749.pdfIn PDF document text
    • http://regmac.net/userfiles/files/naranunivabekupaxaborumi.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/037giav0vefjs5fkeuri4t8327/winir.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094ab52df570---37955257145.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/8c97ddc85b03992e49f4626b4adb7dde/naniluzituxamilusinivuw.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160acd241ee5c1---25870748998.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/beputedukisetitozidise.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/12396210271.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/86111560103.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/95323217099.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/84199030654.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/kemazoziwefur.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/wulufegowujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+nature+of+things+body+language+decodedPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001203b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203B 11072 bytes
SHA-256: f041b72495f08463763655cf32b93965d75d295c46e89612667c7634d88dae95
font_02_sfnt_off000139c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C5 17236 bytes
SHA-256: 0d0ade679c86b5a3e70e4230888b083781f4bc2beb2f4e16a3a9244ae27813e1

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