Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a06cb8bf01af61…

MALICIOUS

PDF

76.5 KB Created: 2021-09-07 16:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b2b30ab757d4c4d4746229326d8ff232 SHA-1: 378347df4c436b10c521a55e795617ea3d589e3a SHA-256: 36a06cb8bf01af617012a67d02d2af0b3ea33a82039ad73480588578bd4a5208
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to various compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and the presence of external URIs indicate it is likely used as a lure for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://philabc.ru/uplcv?utm_term=terapia+ocupacional+en+salud+mental+sanchez+polonio+pdf PDF link annotation
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160710f111441d---88854445500.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/24417968827.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd008bdbcf---mupebulolet.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087560fd1ca4---2471931060.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/patezobotagigaxo.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/lubufudolilufenobeladigu.pdfIn PDF document text
    • https://profm.hu/files/file/wovirozurixe.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210826_85D22F2F3FF37CD0.pdfIn PDF document text
    • http://billsky.ee/files/file/2131045103.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/jupipumudiposemi.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/44868712524.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/dotit.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/15287561062.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/f9cfa0e3c0a22c4cdb70ff45c3c5830c/bazisafurixexaxutufig.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/zuxizafuw.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/luvineji.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/domoku.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a02a8f15633---kupijako.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/54269480432.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/cui5b879vs2493573kpq46on92/rukipebaguwadowo.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/bawuxemetixine.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/76463306629.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fa7b6e34a---96776653399.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC16C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97E 18652 bytes
SHA-256: 83b1d4db6122e9ee52505a40d62e4fdc8e8420373a949abe1c1966615ca118b8
font_02_sfnt_off000108b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B4 11008 bytes
SHA-256: 4bddaec7aae5a255ef9d917b8d0f6acd54809ce9bd784ee0ecbe42be4b906ddf

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