Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fdb771ecd777b85…

MALICIOUS

PDF

84.0 KB Created: 2021-08-15 02:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 792d03a67c06ad621cebdd6b1e67c1d9 SHA-1: 48ccfed051382bf3962b764fc2094a2fc9cf44b3 SHA-256: 1fdb771ecd777b85a6c32187d130e8f5bc81c3d278244c88fd960d27feb8a504
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://pacpartner.net/images_client//imagesfile/gejaxiwunogo.pdf In PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/046709ef9f3f6576c4008686edf5d478/fukisetanudowa.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/1n1dru65bktv29rctkgm9ulfs7/18661127279.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com//app/webroot/uploads/ckuploads/files/80832358291.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/89675217099.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/84580377789.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/9295222365.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/65801730204.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/94115837230.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/d507a9a905b7e7da44165cb0efad552c/takarut.pdfIn PDF document text
    • http://imaginove.eu/data/Files/56320813403.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/gozabigimolebaxepikiv.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f99ac4deae6---75752874163.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/59846300830.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607531de8eb21---zigofaxude.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/qj03529gg4864i3v641tlroao0/betikitategugutaxuretipi.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d271d19c8c0---77929608801.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16086ec3c21a4f---walijarelupubi.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/dulebotuvajugeg.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16085a0635613a---61894700251.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/1abbc9271c98533b477671fe2b9d0555/jogopovewu.pdfIn PDF document text
    • http://ciskmv.com/css/file/74083418102.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/37005136677.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/23569018139.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d52bda249f---52406994305.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c955eed744---45551625654.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+read+hdb+floor+plan+dimensionsPDF 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_off0000e546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE546 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5D 10980 bytes
SHA-256: 73999f3fda45d2bceddfe1ea0eb5e84aa08952c8fad3d8117bdf4bf7a8089aec
font_02_sfnt_off00011664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11664 16816 bytes
SHA-256: c5a60ff8d9ac2e2daf395d547f3ee59fcce4074cc925dcdac23dba4cf02a9e7e