Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f336199f10976e…

MALICIOUS

PDF

75.2 KB Created: 2021-09-05 02:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bea2b7c8aeb244d36d6d4f229952e4f1 SHA-1: b08454ccadc26e8cc7f4ae67a58c76a43732898b SHA-256: a2f336199f10976e879baa7fbb5a731fd5f8ecdc609d49dc96880521c29b1b5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The heuristic firings indicate a link farm designed to direct users to potentially malicious content. Although no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to lure users to external sites, likely for phishing or malware delivery, aligning with T1566.001 (Spearphishing Attachment).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c318dbea1a2---64359679812.pdf In PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/dd29082684b3f7d3d687336309a37a1c/tuzojedesujorejadixani.pdfIn PDF document text
    • http://ktcz.eu/files/files/gizolejukuluwex.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/e8e948d2517b2ee538ad306502147e1d/botefija.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/jibalolubumubev.pdfIn PDF document text
    • https://latework.cz/soubory/79694514495.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/mgiqs58vaap360lumku3l2p7tq/32350826081.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/59517126900.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/dusaf.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/43222677002.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f5b0be168---wufedajogixavibezegukofub.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cad3e756e9---92167781658.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/70558017142.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/48d6dd11a235637525d537602fc1125b/1334090998.pdfIn PDF document text
    • http://sushi-belovo.ru/files/3489374943.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/folulofipevade.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/bozape.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/zowexozelotimugebanid.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d56c88ffc---jamomofo.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/92423759982.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/08a1d8ab6c91eda3c211a04fddb49e53/96480835010.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607119a332446---lozevisesarudar.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/12095839464.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/28011113634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=automobile+spare+parts+catalogue+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_off0000c08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC08B 11080 bytes
SHA-256: 65f27c5f2d5bbae305712f982f4608d6cae2612f39093f32c3fa4ff7aba0a77a
font_01_sfnt_off0000da05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA05 17380 bytes
SHA-256: 92166aeb3a8879e78ef044f21ae080563b0e90aa4417ed735c4d13eff31f3da4
font_02_sfnt_off00010677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1