Malicious PDF — malware analysis report

Static analysis result for SHA-256 62afc462cc73f342…

MALICIOUS

PDF

76.8 KB Created: 2021-09-17 04:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 383308afc20418aff2493efe1aaecc27 SHA-1: 113b6936b552767292d3473169b68502a2d7a782 SHA-256: 62afc462cc73f3420733005d75f55fa1714410a72cc5aef63a07e858dc626018
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to disposable hosting or compromised CMS upload storage, suggesting it functions as a link farm to distribute malicious content or phish for information. The presence of external URIs and a link farm heuristic further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://arohitourandtravels.com/userfiles/file/35727170662.pdf In PDF document text
    • https://ldoris.com/upfile/files/20210911040129.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/56725076973.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210901232110.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/funujakipitutixepenik.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133df0a47758---nodofefur.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/6919345390.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130232ba7277.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/77212314247.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/safejeruwidixaxaf.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/43929772872.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/48237830974.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/91502842840.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141854e651c4---15313228223.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/58901328487.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/vavimabojekovidid.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/fivuvugu.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/96313887294.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/zuxosugi.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/zukividibepokilaramix.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/vopoluporosuzexaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=call+recording+option+in+redmi+note+9+proPDF 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_off0000c6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C5 10888 bytes
SHA-256: 1a1a568ed7d8b90c1ad473e52ea0b0159ea2265ad2ed74c01822c7e1d9bf3e89
font_01_sfnt_off0000dfb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C5 17772 bytes
SHA-256: d9e2c6465e0ed9dc3cd3129085a712fced6af223c5488198782429888761a9a8