Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d33f90dcb1bece6…

MALICIOUS

PDF

92.4 KB Created: 2021-06-29 03:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 42d08fc44f19cd8b2dccf3d9ca6844f2 SHA-1: b8aa2601a078741b1fe04ffc8bceab21bc323073 SHA-256: 7d33f90dcb1bece67560550bdb749e8912f193ca402e1eb8318f9539098cae41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://nomylo.ru/uplcv?utm_term=pyramid+faces+and+edges PDF link annotation
    • http://pathtojanna.com/userfiles/files/66840748240.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/17165190797.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3b6d5b6ce---75318531171.pdfIn PDF document text
    • http://blueyee.com/upload/file/201746189855.pdfIn PDF document text
    • http://garderoba.sk/images/_file/68079785711.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91098e8fdc---fugepomafakaripupudolefak.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/9072079709.pdfIn PDF document text
    • http://imi.vc/upload/files/84608353600.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/36885334731.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6f2b2ea04---25529094154.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/41ac28d14cf3050c7f6aef2059f549a0/japafakizevapirekaxuni.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/dobopujiwevumanewo.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/84203424133.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920c2bb939e---63726735057.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/mimifuvot.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b204eeb1319---zufesosizowiv.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/disopuruxaxunemagatigijin.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6999268d6---13937213164.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16223754088297.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/0bf0cd36f63b24210ff79e94e1bee51f/punozupufaseboj.pdfIn PDF document text
    • http://sciattella.net/images/file/74637669744.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072d2f612911---wilemenabumufotoda.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/lawezasojeb.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/nogisijivusawijagu.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999f3ad1d50---nejubobanise.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072f68eeafe3---ludelorenakevagarin.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE36 17596 bytes
SHA-256: 2243aa89059caf4ebc6c8127dd7f9d7f12ff64cab970864f8cdc808011c2570b
font_01_sfnt_off00011c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001349f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349F 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_03_sfnt_off000149d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D5 10668 bytes
SHA-256: 968099cda9a14e3e2b2cb1344745f3f234695c5b3d7ecac0260b28eee0c6f6c5

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