Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f955cc8462cd44…

MALICIOUS

PDF

77.4 KB Created: 2021-09-05 15:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3efba97ef0ac3341a0d616e18032f943 SHA-1: 48e69d70003cd70aac75c94160bca3314cb11718 SHA-256: 50f955cc8462cd442fac305eb288fb0a72a6a40a416d4b9733e52d0cf358c150
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or tech-support scam. The heuristic 'SE_CALLBACK_LURE' indicates the document likely prompts the user to call a phone number for fraudulent reasons, such as fake billing or subscription issues. The numerous embedded URLs, many pointing to compromised or disposable hosting, suggest an attempt to distribute further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://pass-eco-energies.com/ckfinder/userfiles/files/birogolodonolesi.pdf In PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/7ldbrutvhqbosso11v4qr21bj4/valabika.pdfIn PDF document text
    • http://shopcloud.cloud//ckfinder/userfiles/files/32939080173.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/77370010105.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1626632362tudaleralobegirowupexesix.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/majibugikoluviwawusefoke.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/77176733644.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728e457d3fa---21030461381.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/81821645951.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/b223c817034b8d77d2456f17cb4b8c70/biduliwegonojera.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/loxikezuberosexujovuxuk.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/xubefapomosiletetotapaduw.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/folokuludebekowalov.pdfIn PDF document text
    • http://888chji.com/userfiles/files/jebipebumoxalubaf.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/duxexuvi.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609de7f25b14a---futepomevufetovo.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/856c9f03b73a96b2defc44d90de1c509/15323436926.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/bavipiwinaxam.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e46a593bb---fikufajutareb.pdfIn PDF document text
    • http://theprintfactoryvietnam.com/uploads/files/xuzimedowof.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/10d8e38df536f600e43991bfedcfbe50/41105019872.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/rinupokevosusowuk.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609430ffbdb29---dekusiwoxofapobeda.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abcc6b6da6---38731115582.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a43cb1508c---72585467683.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/df14b2b0914b54b89a6a7795f8420575/85600644652.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e37db3629e1---36473532458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ebook+ronggeng+dukuh+paruk+pdfPDF 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_off0000cb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1E 10688 bytes
SHA-256: 249c878b3495c32813dca48fcb4eef9da5ff0171140aa2c470a029f9130632bb
font_01_sfnt_off0000e31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB30 17180 bytes
SHA-256: cb5b7f3d4f92612c4dbcf305936483339fcb51c8b00278bd8aa83ab54963f5b0

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