Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f43bcdba30fc309…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 17:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 30faabfdc6e4dff2c6ac5071a01fe85c SHA-1: df9c99faf1bb0bb75f6fd3eab9b7ac5ddb11d855 SHA-256: 0f43bcdba30fc30937e20079b4d61badeeaa68c60d030b02ca6e0d862ff5bd1f
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised or disposable hosting. The presence of numerous external URIs, including those on potentially malicious domains, strongly suggests an intent to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://epplast.com/files/file/jepojumalebujonaveviwegov.pdf In PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/benalizenenuw.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/xepabamo.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/55880243191.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4841372e12---20297861085.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16089b2624f926---14482611675.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/5b0f257e75d9b11f74b5839d0874c2ae/75799513118.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/vatesuvenelimodu.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/5c401af3413d3e7d28c775921056b8a6/guritetiri.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/50537782856.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/20968398814.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/n4aqkhln3ul7hcq0n08cv31oh0/wubipe.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c493d57c7d8---bozixinedekuturafopiwox.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc880eba634---dozadilamaramosovub.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/62b2771b7b223d5fd29ef19b18380f6c/20154967417.pdfIn PDF document text
    • https://hirurgija.me/files/mijigajusogin.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/96112120830.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/80353506090.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/d84d12a2769bc6ebfe324fe8cfe9f4f6/2272965362.pdfIn PDF document text
    • https://kawanmto.com/contents//files/famunij.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/72800914979.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/0c4cf688da70e8749e5f01c50302db19/kebutumikezigumixewin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=market+segmentation+targeting+and+positioning+for+competitive+advantage+pdfPDF 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_off0000d978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18A 17252 bytes
SHA-256: bfc9f4568273bc0d59183a81be2df2d1e1617c868fdc2f943bfecff1746e35b2
font_02_sfnt_off00011e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1E 11068 bytes
SHA-256: 5800b661b2d1b2befe3f7864e669c4a42fe50255322398e0310629467a600d74

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