Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bea2c9a5395184a…

MALICIOUS

PDF

89.8 KB Created: 2021-06-26 00:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1157774533f7548116b40dbd8a2f782b SHA-1: b6c2f30e941326ec2088cb75f6c4e9b315f7d80d SHA-256: 2bea2c9a5395184ae73cadb7f2404921e7b5ff1f6f6d6d71a52bb70d2f5bad79
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript could be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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 http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e153fbbae0---putinolijazuzedujowozo.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/u5gj8hqlkp8r4l937drsj5q3fi/58035015601.pdf
    • http://akinmedical.com/uploads/file/wigivutopoderemuxeduri.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/67aff1fd2587d8aff5ae44f2acdb61ea/vozapo.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16083db752f268---sukokikizal.pdf
    • http://condosworld.com/abisol1/userfiles/files/50030049423.pdf
    • https://yssnewlessons.org/UserFilesTwo/file/29827651721.pdf
    • http://katachizu.com/img/news/files/goserozez.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608998a82b655---fafijogufe.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd85ce6daf---67526821284.pdf
    • http://daieimotors.com/js/upload/files/berevulawoposubijobeku.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/ae753d012ce5f4d77f3f8356af2cc754/nifefupulebetezab.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5310b35bbc---wozefala.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160aba94918aef---bupizunukogiwofiz.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/513f004f83f6d0be624423fb60a4d1dc/66591594934.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d315e51b3---18725152596.pdf
    • http://ainut.fi/userfiles/file/985461632.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/21555658395.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/iim8fp3j4bdgj3lpsm19ph4n2j/86779605952.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05e646b3d5---42733171251.pdf
    • https://marjoyunlar.com/calisma2/files/uploads/luposopamosa.pdf
    • http://mamtomchabahai.com/uploads/files/files/54087244127.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pdf+maker+without+watermark
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdf3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF3 16792 bytes
font_01_sfnt_off0001160a.bin
86a4c3b9b500bd7b940338b72cefd3b8dfabe6aeb17580424212f204fbff041f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1160A 10580 bytes
font_02_sfnt_off00012e42.bin
d63f3562b8ed7fd462ef3d8b5fba0d7f7fadbca4d266f3f93a216818f2efca79
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E42 16956 bytes