Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d5fd6b906012c6…

MALICIOUS

PDF

115.6 KB Created: 2021-06-26 01:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7307d5468d1be13bcd8ff72db4c13fcb SHA-1: 9a32bb94676cb0899178d67efbc9c27307e5adf9 SHA-256: 58d5fd6b906012c6b97810f3de75f1cb6259d1787af6ec8b910cee7dea4be400
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, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains, likely to distribute further malicious content or phish for credentials. The document body is unreadable, but the URL structure and heuristic firings strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xboxheerlen.nl/userfiles/file/tezazatazitaliwotu.pdf In PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/fb65d78985e8ae924ab13d6a853f4367/vevimifa.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/59127902685.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/10405881724.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/384f60f85555dcbb536ea6e87df19052/nuzagiwegu.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/jazamu.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/4cda92e440841dae24b2a741ff3d6bd0/wibenejuwanuxusipuvej.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b414defb45---mubag.pdfIn PDF document text
    • https://sca-kc.org/scauserfiles/files/zeterarofirodeperejopurob.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/bomotatuwetegegijifeb.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/f2f0ftulov2f724d464m8j9ie0/2809697586.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/fawujomuba.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/49102b91cbffbe39d7adb9f21b7d73de/10236910846.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/6e0ad1a0fb9c35afec14ab55064a0d12/90031818730.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839bbc8f126---dixolusejemapepatad.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/49600d8d11a40c9bd691fe7f3c312a3c/37699354824.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/1685353a62c977a69e58d1e978b8d233/93473032306.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5e9b42ddb---xigoxuwopemanakisoron.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/42999699771.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084322943763---56497501877.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/n95hiafuv7mu8vakgu1v5s9el5/46825907003.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/370a53574c20414691c08d63273dfdb8/webugetugit.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074b210d2052---23429013061.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/40718573408.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8b5080543---fodizubi.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/24348538706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+reference+manualPDF 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_off0001612b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1612B 18420 bytes
SHA-256: 8855ad69c908a7be95f94e80dc7362279cc40b95e64145f123aed5b90e058c7b
font_01_sfnt_off000191c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191C4 10412 bytes
SHA-256: ca0bdf593260aaa5f0a236add4ca096a85e4a8e4290ce572b8f519c757046971
font_02_sfnt_off0001a968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1