Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a7659a1d391b647…

MALICIOUS

PDF

84.6 KB Created: 2021-07-18 04:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 63199c4444f7a797fcb196806330d303 SHA-1: 7a14501287b07c1299cf690ed22dbfb887547ab7 SHA-256: 7a7659a1d391b647ba40b44701484b76efced2b9f2dce3f913bf428633365e0d
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack vector appears to be users being tricked into downloading a malicious PDF, which then redirects them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d760470eb99---livafixitovoba.pdf In PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae75703d72---51258160614.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/97658018090.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8825bbd808---73636718354.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/55882892974.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/a1ee614ac0263471dad12c22bb858939/jipuvajiw.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/97603308675.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/7927705837.pdfIn PDF document text
    • https://rotherelectric.com/files/wejebotasilino.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/miivm42mbmffr3nuld4b6jhcvd/57514672469.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/97248458160bb35df8732a.pdfIn PDF document text
    • https://kildevangen.dk/files/81211450932.pdfIn PDF document text
    • http://sooclose.eu/upload/File/20286957793.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/56821080159.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/b5149eac12368eb037d184dce8259187/jegiga.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aefef9c8999---vibanakoboxotofaxakeb.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/5d5a541b4d8f337311ea264b281d4661/borijetenekogejokajez.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/31245609042.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/34774010550.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/77634560797.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607602c7dbf27---zinexijufivi.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16078794b39d7a---xelolowamitog.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/14539264460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=rent+roll+documentPDF 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_off0000e95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10176 10252 bytes
SHA-256: 848692ae71feba56d2cfb84cd0d033078d3883afdbf3ca48c7cbb0af76eb80cb
font_02_sfnt_off0001187a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187A 17180 bytes
SHA-256: f7104775667e3166ed74c599fe6fe8bd01c94b51b769b249dd2b747d370a0551

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