Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e99844e253b662…

MALICIOUS

PDF

88.6 KB Created: 2021-06-30 01:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 39e533b1189d88a1c37416c48498f5ee SHA-1: 75ca56ecab11ecbab04bc29f3daf92c7b50a47f9 SHA-256: c8e99844e253b6626bd040e1a4b42aeef00498e0cc33f17e6ee15cae77b33d7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure victims. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL analysis point to a malicious document.

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 http://botosani.ro/img/uploads/file/xafidawune.pdf In PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/e4048f4ab8eb6bcc7ccfed7cd798e663/pegonatezezutum.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/32762476823.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/banubulobananujusaxedukim.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c51e690153a---roveziwukununusewezof.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/itv5f35dc8v4equmksiannlns8/pobotazasu.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/u3buhbacftang90b5lnd629b77/fileg.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210531184704.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef900cb2df---37677962617.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7ff371f8f8cfcca252cf044de8398027/xukorobexipepozevupejofi.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/8g0hld6hf695odkejilh2mp6no/taninazaxikunalivodegikul.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/5d6aj688sku3os9lmvhp6g8bk3/poridedoxakijadibuw.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/93812325518.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/3aef3517f48bffb96236aa592159350e/xusopenusuwivaxo.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b24b1c288be---rifozimupe.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c647b5f294---kavatanavumapemiretininaf.pdfIn PDF document text
    • http://rjt1.org/upload/files/deloxodoludefejidusotufu.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/peruke.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720209f13c1---90244749305.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f231e9fce---18418226812.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/996ef470e8aa30d7dc361dddd1186fe4/49812591836.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb6bfe6342---32890143377.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/jawupalujunikagelalarafur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=john+fogerty+creedence+clearwater+revival+songsPDF link annotation
    • 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_off0000f612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF612 11012 bytes
SHA-256: 332dd3080a42db8b4234539a45c3a35a619f741ef8fa1ab9b4969d984d008f6f
font_01_sfnt_off00010f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F85 17520 bytes
SHA-256: 910367156375a4b156eb9b5288d16e252a0de531b3ccbd11d63719acf989a6cb
font_02_sfnt_off00013cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1