Malicious PDF — malware analysis report

Static analysis result for SHA-256 225802f8475c2a4f…

MALICIOUS

PDF

71.2 KB Created: 2021-09-20 08:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aa87c5bfe08f200fa2dba7be3349f870 SHA-1: 2acdfcf686f31d6933fd9b383eebfe9f320d132a SHA-256: 225802f8475c2a4fcab57f252b4f88833d20b3a8ec4ece3b8b72d19efe22d4dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://koreanhotpot.com/uploads/files/35253462062.pdf In PDF document text
    • https://actorconseil.com/files/file/25877548828.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/gasabibotekinoba.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/fuwakajajagisolan.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/gapev.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/76496839989.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/buwes.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/fuzotexareze.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/rurapigububomuxawegozo.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nemubimixitopakorif.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/d71d7033673926c5a03eb9d3d8e433f1/42806392809.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/87719898600.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/49498191210.pdfIn PDF document text
    • http://flomojapan.com/upload/files/kivuwijoxafasugabozi.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/8b88510dfdac9192b6595d641da02eb9/gidofuzekaliratebe.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/33155195495.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/76367264759.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161480a20d4cfb---74195939656.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/51072896209.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/kurukuvovaveziri.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/lasesifinowexe.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/wemobubitemogup.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/vevipupijawag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=3d+waterfall+wallpaper+free+downloadPDF 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_off0000b8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8DE 15364 bytes
SHA-256: 716a21d90aa86a9347359f9162e5d1b9709f0ca1489f72afb155e32f80d21406
font_01_sfnt_off0000df9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9B 10392 bytes
SHA-256: 3007c0fd9ef11c492b2062eca19178bb4b4c22a46fc3a623c508f5d300bb29a3
font_02_sfnt_off0000f74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1