Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e1cfc589df0699f…

MALICIOUS

PDF

88.7 KB Created: 2021-07-03 22:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a619d6a7ef18a5fb74fe0a2d7c331482 SHA-1: 4f5b4733102411c00d3075b785bfed73b1aabbf1 SHA-256: 2e1cfc589df0699f0720a045eb81baeac16a34eb148c115036bfb4a173fa44a6
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous links to external URLs, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution by luring users to download further malicious content. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=organic+chemistry+lecture+notes+pdf+free+download
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/c43e1b9d71eb4c28ec100baca35aaa7f/melevalene.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3714a2102e---46727743010.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c463e1ab893---41082369211.pdf
    • http://amoy-art.com/Upload/file/8948098143.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784d8bbcd8d---vezomorudi.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa1c06e9de---pobomekozixujar.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c722511d84c---jirimijugogof.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763f1039e5a---44897565673.pdf
    • http://evola.it/userfiles/files/47666792456.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2141cee606---pitirupato.pdf
    • https://go2germany.ru/files/file/sarobolovuta.pdf
    • http://baigeleather.com/userfiles/file/245565133.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/776084da8c2aced27519b4806fa0c5ae/65931338705.pdf
    • https://yepsell.com/userfiles/files/bejixamitijopadavosulatux.pdf
    • https://dondepodemosir.com/userfiles/file/voropuvufidanisamakodir.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/to6ul3gj43iten7qmubta7sen3/23927577254.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/g60qna6popi3cf5pkqq9r67ste/xajewa.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834a8c8f68a---64535584837.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/255f5c09c86f0c391f254c1e6c6f83e8/sabij.pdf
    • http://driver-jazda.pl/upload/file/48242124266.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b035b6bccd4---74145573576.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f61630941e---51247232287.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5833abcbe---17136288902.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012d6c.bin
ce89e1242c087fd784a58ac4a0dbc98b1586b23b28a6032392ee710f29e96b91		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12D6C 21548 bytes
font_00_sfnt_off0000cd91.bin
81208d07a7634377f35d550de11a19a5c15e3a85370abcf7f26c765d0c15ba0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD91 17548 bytes
font_01_sfnt_off0000fabf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFABF 16792 bytes
font_02_sfnt_off000112d6.bin
3f053d24bd25e7e6f2582fb5a7342ea19980f058b502a6c4691e53d3a3b05616		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112D6 11392 bytes

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