Malicious PDF — malware analysis report

Static analysis result for SHA-256 463b7c576b267b41…

MALICIOUS

PDF

91.0 KB Created: 2021-07-17 01:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6026320024a67b9625c9e29f5ab85c8c SHA-1: 318d1f21f9e739e0f75c9308f1b9cefeb95a419c SHA-256: 463b7c576b267b4180c0db7ca59fdfdc2e65fc3064e5b8b6c284429cb0d4392d
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://klcmekatronik.com/ckfinder/userfiles/files/kabarituroz.pdf
    • https://aimhc.com/userfiles/file/6687083905.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/ruzisoruxi.pdf
    • http://yilip.net/userData/board/file/datimawit.pdf
    • https://ises.ca/phpsites/vertical_living/uploads/file/92747347153.pdf
    • http://indianaquesters.org/clients/9/95/9573c8d6e108c9729a37356986dd5b5e/File/56806632392.pdf
    • http://liebherr-tr.com/userfiles/file/xozowavapitanimokunix.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/9e7d4589590a5f7349911b6460ce5c1e/voluwuviratapuwejuxogiro.pdf
    • http://aldo-ins.com/userfiles/file/zukukirikavud.pdf
    • http://waukeganeast1980.com/clients/877304/File/tipuxenikukojedobizi.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075b65e5efbf---10751122485.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e393cb0c863---87594027236.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2276d3875---10159598510.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/1lpukc67l16219090vmd87fh37/98522349331.pdf
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/bikelatudozek.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/3f5da8e32db2c5a4c045e95a97254286/ludep.pdf
    • http://littlepearlspublishing.in/data/eimages/file/zufuzojevulenikelisewafew.pdf
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/ripunedurikugomurapa.pdf
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/48329354104.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e818b8d3b---kubugezurawuzekuboro.pdf
    • http://www.biotanika.pl/upload/file/wupuweku.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/uiv7ko21ehcb2dhuti7k3sibg0/45757143241.pdf
    • http://rosabaum.de/web/editor/files/76664399465.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/82905d3fad9a2635d81af580af62dbb3/90485610080.pdf
    • http://casaatlantida.com/userfiles/file///27571027819.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16075c9062f42e---xowasidudosave.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=small+white+worms+in+bum
    • 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_off0000ffe9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE9 16792 bytes
font_01_sfnt_off000117fb.bin
f9c5cfcc966bf3587391d578d87b9f267ae3a1c712edb727aa845a65f25769cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x117FB 17544 bytes
font_02_sfnt_off00014610.bin
f3dc779ffa75dbfd735913592d3717eb0f425e3eef936ab3f3acde048abb1f93
pdf-font-stream PDF embedded font (sfnt) at offset 0x14610 10772 bytes