Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f58da670df2142f…

MALICIOUS

PDF

83.0 KB Created: 2021-09-03 16:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0f6e083b32aefbc67aa6294758a60f10 SHA-1: b067c99d98ecb7ba2b9bed13e194a5276d3aec5a SHA-256: 8f58da670df2142f88afd7192b0bdf4aeb7d6234c6496126348f7d79932163a1
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript (T1059.007) further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=mcdonalds+calories+uk+pdf PDF link annotation
    • http://piri-piri.pl/ckfinder/userfiles/files/8133315830.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/98746749240.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/waguredevimaguwoves.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/91062043330.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/39690818598.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c043ed9c6c1---sofimarel.pdfPDF link annotation
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/02e578e05d8865321aa22ce64c5428f3/memoribepakekufud.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/77525420796.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/cc900bdba657330dd25a3d5cc0226c1c/95725561792.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/risumesodamelirigufem.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/gd15bin8f34sk9n82udp4mjael/lozozarotapidivoleke.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/68087706261.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/bemejipipopijo.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/dalinulisepugawufolur.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609048faa1ea7---zekirufejoli.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/fozus.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607916c8c8646---50108723953.pdfIn PDF document text
    • http://tele-video.ru/upload/files/fazonufometubozalafojagid.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d4e9d9caf---rilofajaran.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/xifalodanuguvopikab.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/f6d92e0bcfb2f4afef00ffa480e734b2/juxazibose.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/fatumavoxuluvu.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/tovabupipaxa.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/jamobapagenifaniwi.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/dudifefa.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
stream_003_off0000c334.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC334 17856 bytes
SHA-256: 11549057d1ec2f52ab97c30fef0e0cb5a0e18d8a2ce9ca2a7f1f9cded986424b
font_01_sfnt_off0000ded0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED0 17804 bytes
SHA-256: 9bf3f3075b1513e6edf06a9d897e5335ee54619cbf54dbd1e129d5107f93f75a
font_02_sfnt_off00010ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000124fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FA 10700 bytes
SHA-256: 4626b8d5316b9a17a780bdfcd22d9452050cb3791af79e315d6bacff55aaa1e1

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