Malicious PDF — malware analysis report

Static analysis result for SHA-256 138fb7af9f4febcb…

MALICIOUS

PDF

75.3 KB Created: 2021-08-30 17:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b5a239f3d40dd9c6356a6a44b4c1cbdc SHA-1: 3e3af4b73a92e19e91061877118c636f7b37bc15 SHA-256: 138fb7af9f4febcbc9f40da3d04113d1ba4f9ef43595d425465a877d7a26b896
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics indicate the PDF functions as a link farm, distributing links to compromised WordPress sites and disposable domains. These links likely lead to phishing pages or further malware downloads, consistent with a malicious document lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://archism.ru/uplcv?utm_term=examples+of+vignettes+in+house+on+mango+street PDF link annotation
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160713c3995358---67006350611.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/tukakozoruwedezukuriv.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095edeb8df5a---44381491588.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/kosugija.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/wixoloriwet.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37b4e5b119---15951116635.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742be470865---pozepimesoxo.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/vudagigepogadonozogo.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f07680090ed---89764991661.pdfPDF link annotation
    • http://jnnycc.org/userfiles/file/mepajifugadowerurubi.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/judujosira.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/dezixozotekavagekidi.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/6436117655.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/kowojozizesanivazedawema.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b41cbeca133a26abb8e78aad7a5ca457/69599196782.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/43759029543.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b54bd12527---97476958176.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/51001763631.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/muxogekiguselofev.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/vizetupibotiwuziv.pdfIn PDF document text
    • http://museeducuir.org/upload/files/lowugusedurimejeje.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/nogobigirisenotilotakokav.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_off0000c2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C0 11056 bytes
SHA-256: 525d45c43524a361ad9b1d9bc61ed0b0be01830c1d0f79c020fc754afb7bbd39
font_01_sfnt_off0000dc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC53 16528 bytes
SHA-256: 36024ff09623d93df973403b8c06870fb7e15e8777c394de3ed474696e43c5a6
font_02_sfnt_off00010695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10695 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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