Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1826108ddab6208…

MALICIOUS

PDF

72.5 KB Created: 2021-09-20 09:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 34f4ef571e48f468a281891e331e883e SHA-1: 4ec097306ef8524ff4843a4564c13d8aa0c80c6c SHA-256: a1826108ddab62080c86b445c1e02a2430e3d8a397560123e38e7089d6901729
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to distribute malicious content. The presence of multiple unknown URLs indicates a phishing or malware distribution attempt, likely disguised as a lure for a game download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161305498b7222---83946348148.pdf In PDF document text
    • http://alimentosldm.com/userfiles/file/vunowipogaf.pdfIn PDF document text
    • https://servicepapik.ro/files/40706215040.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/zozujaxulusuti.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/xowarosevajotimisa.pdfIn PDF document text
    • https://gerbangkuis.com/contents/files/rixodaleladojawupod.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161481fd161c71---10220490072.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/35695909649.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/fepurawaxa.pdfIn PDF document text
    • http://aprt1day.ru/file/62578250409.pdfIn PDF document text
    • https://sistemkabin.com/ckfinder/userfiles/files/63807283182.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/liroxikiruzujixum.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/abe9de6dd012f82cbe560b45aab81cce/nijozewota.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/68539842898.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/nebepukenasil.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/jiguwodaled.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/gosubexijisenekigowuk.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/40527759881.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613c999fc8c70---pegobufagunabajodetaleraz.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/pemujiwewolijafetifivak.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/vugiso.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/c343026fde08bdb9ce7b3a667ed79ba7/93572900289.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/17879251203.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/litisidikikirix.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/7318613537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=walking+dead+game+free+download+for+androidPDF 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_off0000ba57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA57 10604 bytes
SHA-256: 7ed3f33be1a3383f93fbcdaf88e017d4216353c5004bd5c89aae610b6b6256fc
font_01_sfnt_off0000d251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD251 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA63 16324 bytes
SHA-256: 5a047302aeaa6c5b0e10dd39dc4d02677c6831815f0e7452b7a30558f2061f35

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