Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d72ff629c27a2c3…

MALICIOUS

PDF

79.0 KB Created: 2021-08-11 18:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4e053c48be94f153bd76ea4f367cf9d0 SHA-1: d098b3eb9b17970a277ab596c5cb6c37054f9ba6 SHA-256: 1d72ff629c27a2c32ec769c713c751d969558974e1f7bb7a44d6c0ed60310de2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and a link farm pointing to multiple compromised WordPress sites, suggesting it's designed to redirect users to potentially harmful content or phishing pages. The presence of JavaScript and the link farm structure are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://laborke.ru/uplcv?utm_term=2005+polaris+sportsman+500+ho+solenoid+wiring+diagram PDF link annotation
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/e54fbe0f00c5f7ab01e15019def41cab/fagexutulubukubedewi.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b33bd1eb2e---14080989907.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607feee17bca0---43671758558.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/345ce104cefa0ed1b130aeb5024a3b04/4986286734.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/fasepadi.pdfIn PDF document text
    • http://luminex.pl/upload/file/wogumanime.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3f848c97611b90e430654d698b338a72/sopinaxupul.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/39477201298.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/a444877490b5ae1726c300a76d24b662/movosoviwowetatate.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a612aa96f5f---jijovi.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/36ac750b1dd8af6d6186d0da7c00ea49/74974162844.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160af953e7e244---lapizusuwitenalilaserira.pdfIn PDF document text
    • http://kurdumovldpr.ru/uploads/files/jakuvebu.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/8da40ab5bc708bcb4a5d8602180c2531/46880416211.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/933053c6bc8e92260e1a038429e122d2/20927387464.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/88872170535.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df05c89188---fovazaxoxifenomu.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bb7df1b67---88836190475.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/zusonuvosejikadimuzaremi.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/figigabu.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/18823916268.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/fodekamazir.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/cb7b83e6d8a7cec2200ca1dee48508bf/vefetositusetisur.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f2dfd2b96---25486963312.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/fikinemevifazodiwupuf.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_off0000d448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD448 11204 bytes
SHA-256: 6efe110f8eac3e65d470f0ba6b0dd3100d9642b0821219772ccb3ab1e63e262d
font_01_sfnt_off0000ee31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE31 15292 bytes
SHA-256: 04534db6bc7e49fa7935115928594178b39c5355ac8d7d4983f9210bd74108da
font_02_sfnt_off00011572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11572 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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