Malicious PDF — malware analysis report

Static analysis result for SHA-256 7053bdcfc1b719a0…

MALICIOUS

PDF

82.6 KB Created: 2021-09-23 15:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b61b657cd7aa93eb7264818eb8a145e8 SHA-1: 8db6b19c718836cc5edbfa271aa84da5839701c4 SHA-256: 7053bdcfc1b719a0d75232421e9f31e7b3c45b70c120f091dbe76257edaacc7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with several URLs pointing to compromised CMS upload storage. While the document body is heavily obfuscated and unreadable, the presence of multiple external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16132ae0784d79---97498800914.pdf In PDF document text
    • http://auto-rad.pl/userfiles/file/pemap.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/lozofituzokepurifip.pdfIn PDF document text
    • http://salespate.com/userfiles/file/zoruwuviw.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/detexedunefesotal.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210912005343.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/muvilazogaf.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/lezuginokigasenutulufo.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/18598892874.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb05cecaff---gitijexopewa.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/80676276031.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/90303627149.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/53475260817.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/fewozubegajosemavokade.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021917_173939_862.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/lesebukukulojeb.pdfIn PDF document text
    • http://hkacca.com/userfiles/14013048304.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/58429281603.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/ec6690a32c9b429ed3d0d3df8aa6bbd1/598051929.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/fbffd59cdaa0a6561dc0d9d0a1082c7b/papexajebokosowuxuv.pdfIn PDF document text
    • http://suaups.net/userfiles/file/diriv.pdfIn PDF document text
    • http://asid.rw/userfiles/file/wogojaposegumufovix.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/94181151802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=kingsoft+office+for+androidPDF 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_off0000d963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD963 19304 bytes
SHA-256: ac0fa19147e833b9e6345aea1f2cc0a567d0c27dc00cbe0ddc209f40f6b12e60
font_01_sfnt_off00010cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DA 10596 bytes
SHA-256: 6467fe93ce64bf375cf0762978aec3f787aa43c54487d69b8e7e6033d0f30853