Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fd9e9705be4020…

MALICIOUS

PDF

86.5 KB Created: 2021-06-26 21:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55311977d03dddf88698ae2e1555aeca SHA-1: 8163fbf1e105bdb138f9dfee7435288cc2c36be5 SHA-256: d5fd9e9705be40209800c87e743809abb3ee4815058a2664a1ef02a57cdb1639
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and is identified as a link farm, likely intended to direct users to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the nature of the PDF and its numerous links suggest it is part of a phishing campaign, potentially leading to further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=how+to+build+a+stone+wall+in+minecraft
    • http://odpadykj.cz/UserFiles/File/somiduguvewone.pdf
    • http://51-lq.com/userfiles/file///3229490131.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe4e0ecf81---66620322610.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c10033b8574---82856465885.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb7cae447---vidilubunozapad.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/dbc1ff302cf902aaa4d666084d6ea3bb/pezudisajararibugugok.pdf
    • http://perfekttorun.pl/pliki/gikigemigofaxupofedi.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/977bcd1fdda065297641635b21ce76fc/98871506267.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c270d2ce834---37995417276.pdf
    • https://advance-pack.com/editor_upload/file/14648940089.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/fufeksq8634dtgusfsu1ra9oj5/12802119356.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f348e6dad3---12897216035.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/splhm6etp4hgloif4k0h8vv5q1/zolepawonozokujin.pdf
    • https://kodcomputers.ro/2664/uploads/36110084607.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/0c90c4afab09de43e477b3146bdbdb84/25571701417.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/666a82463466eff741265892ac04d23a/revitatusutarewiwa.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b971169b520---6161584384.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/fawapawovuvipijidif.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb0c77d85a---71926434942.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b330381e92d---jerofosivaxirejib.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/alh1v3o6vka4kbo207kupiklc4/4989490475.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6855304968---92162457413.pdf
    • https://abofahed.com/userfiles/file/panidenabazekinaxo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef9a.bin
62a7524ad2e5f24bd2ba71602a2cc53d431e0a5f6d0b8ea3ee1ce79e9e9b8523
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9A 10952 bytes
font_01_sfnt_off00010903.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10903 16792 bytes
font_02_sfnt_off00012115.bin
0db82f4e6cd6764ff74889ed972ba7bfe9e5af62821350a8b2713a4d82e0ad67
pdf-font-stream PDF embedded font (sfnt) at offset 0x12115 17232 bytes