Malicious PDF — malware analysis report

Static analysis result for SHA-256 20dc1e51b8621181…

MALICIOUS

PDF

88.7 KB Created: 2021-09-03 05:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: caa76c1132f3c3fad4963b629da9ade7 SHA-1: 7dd74e0858e4d60bb5173aa6c73ac2810d72eeaf SHA-256: 20dc1e51b86211818324b8a386d53259288fd99156506834dcfd503e6adf168d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating a malformed exploit stream and links to compromised websites. The embedded URLs, such as 'https://allytemp.ru/uplcv?utm_term=abortion+pdf+file', suggest a phishing or malware distribution attempt. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://allytemp.ru/uplcv?utm_term=abortion+pdf+file PDF link annotation
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/ca747ffb1f4063ed1f5215b9c9b36396/58713597108.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/losufam.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///miwuxeruroso.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/jopixewositukasedipeju.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/dobon.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/fobasozefuwut.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/77647396481.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/vobozirefudalajogitin.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/2612131392.pdfIn PDF document text
    • http://taniaandjohn.com/clients/874109/File/zikamakewiva.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd4d1ce1f7---16501979456.pdfIn PDF document text
    • https://ntc-container.com/upload/files/sajupumojofupogeza.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16118598f63fd1---pijimenononumedeva.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/41758644560.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/84768988492.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb32c60f3b---81796220218.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07aa2bfb9b---70190592992.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/69553411481.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/ggbbovq4v5do912p6013um6jia/zademufos.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/sirop.pdfIn PDF document text
    • http://mebco.ru/images/file/84610239216.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160926668985e9---xoferazunepibilikaka.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a58e9fd8f06---35510596675.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/duzuwadefopaselogi.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_off0000f5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B8 18480 bytes
SHA-256: b86a856a1e47cd3306b495ce782191ba56fcdbfdcda8f275a96065e3185188be
font_01_sfnt_off000125f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0A 10284 bytes
SHA-256: 69d21cf52499922c55563bc434b69552c12129ba37fe5ff4cf30db25099644ee

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