Malicious PDF — malware analysis report

Static analysis result for SHA-256 da88fe9a300d5620…

MALICIOUS

PDF

78.7 KB Created: 2021-09-01 10:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3b146fc667e44168595993d6b6efaaa9 SHA-1: b0762e14655582ad19c265a9fa02ca008a0e8dbf SHA-256: da88fe9a300d56201672db6101b6fe6839fc5f59aee0e65baf6bc108ab75927d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, likely intended to redirect users to malicious content or phishing pages. The presence of these links suggests an attempt to exploit users by luring them to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f2dd03a1efc3df8db313aba4796d49e/63141983158.pdf In PDF document text
    • http://eviljoy.com/UserFiles/File/xenonelun.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/20661496367.pdfIn PDF document text
    • https://kaisar168.com/contents//files/56889328055.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/22973036753.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/b0c3a1b7ef42ba461f0f538b9c577264/73985121509.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/0c10ae1b016e2fc45ea408665320fd9e/55264213858.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/86793037094.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160790468cddc8---xogapesirasewosavopasak.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/b3a88fc7b9d6d5ee87afe60bb5cce034/ganaridebamajesibewin.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/pezadawovekijaforose.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63c6c21197---bepobavigizuwiruzibalesik.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/79006628376.pdfIn PDF document text
    • http://henca.com/files/details/file/17768735797.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/rikerirura.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b740b2222b7---28626207891.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/ef2ccba1997852a239f3c8b3c4d8f9d7/romolupanefobasoleli.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/053512b17c3f9859c05c2ca8cc2b0e42/jonegikigagemejuto.pdfIn PDF document text
    • http://tigaintan.com/contents//files/muzebemewufatitesapo.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/rinujeredad.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/71256711430.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/ninazil.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/56108232377.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/5e4f06d8cdb13ff11675dcf9795425fb/xurotegigaxumomufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=unsecured+business+startup+loans+bad+creditPDF 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_off0000cffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFC 10752 bytes
SHA-256: c9c6fb9f8939edf30f077530e2f17c6766ec5b72caaf5d4ac784f1be386cb89e
font_01_sfnt_off0000e88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88C 17092 bytes
SHA-256: 519d952717b97b2dc67ef5b50ad3a5f961d6d0a4d9b844ccfe55d0e876386a35
font_02_sfnt_off00011476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1