Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd68a9f5146f70bf…

MALICIOUS

PDF

78.9 KB Created: 2021-09-07 03:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b047808e66c93d0cb7c2fe1596a42d67 SHA-1: 2a2bb9943ecde6c8b4646f5e7a1a92e14dc0ffd1 SHA-256: dd68a9f5146f70bfc0464d7bd3d379d3c9a48a292481cad5c27056d1d8490f43
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting, likely to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://aroma--style.net/files/files/bivamupuwareruxukuj.pdf In PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/jmojdg59jaeufvfedqc6upi604/molasak.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/todeb.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080a4e6ecea5---niresuzu.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/d86af471c61a827aaf3f8a155827e0c0/ruduseno.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/85808010020.pdfIn PDF document text
    • http://shophouse.info/images/files/sadolufozewodupekalis.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/xalotawuxo.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/0dbbrh22r3vck67br2m288cd3i/72309396557.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/fed191bad4675e0476e4765aac234d3c/96480160.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/b7e5e513371d8f45039b7a0c767c6544/jirososozusok.pdfIn PDF document text
    • http://konberdbio.com/upload/files/tejexofafurupovemel.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/vibokafelub.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/nokoxakejufatuwo.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/linus.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/gozamuxoxorufajob.pdfIn PDF document text
    • https://bnovum.hu/downloads/21669641048.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609333b48dd6c---pelovubozawutofiwiwu.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/i7r0q0s3gnjckepgdb43qhd8ff/talagubivuba.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/mososoxoruno.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/gifuzeji.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b20b00720ca---65748871604.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/mozulomonafovoxifud.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/zinotut.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/fuzabizilorofijilav.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/62796823200.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=keystone+butterfly+valves+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_off0000d036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE848 17200 bytes
SHA-256: 03e0162a116418fc38a1fbfbccd05ee7b13f3d45a175f96d4edc10cebc85085d
font_02_sfnt_off000114b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B4 10812 bytes
SHA-256: 80f58b2fcec022b84b33d384c70d9238496f2fcead44b1c3751e5c9252439025

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