Malicious PDF — malware analysis report

Static analysis result for SHA-256 49318c9975f3132f…

MALICIOUS

PDF

77.1 KB Created: 2021-09-05 15:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 61e98f69e4b638919cd08cc38b429b1a SHA-1: 658436abcd7fec0922a1f95cc3198c45ae76709f SHA-256: 49318c9975f3132f0896983ac76ceefd3c675433a4b7c5b375ea93aa6f17acdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to direct users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a potential phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f52e8a91c0e---tutuwudokun.pdf In PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e077a642cac---nexeseroxifetivakarixubik.pdfIn PDF document text
    • https://saam.vn/images/content/file/85596319259.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/nkbq4lnnag52f03rnfabgjah8g/dekejasa.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/70fed74f533496deeedf034196d66835/jinaxoxatorax.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/51160958615.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/kujotajamazijukadaf.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/54501221478.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/9f3e550393ccb0d33f33970fbeac1903/gerotiguduf.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/c988b36f4ff45ebdb4c5855a106786f9/572728983.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/63483061368.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/f0839d8dac63ac66a69a395c5877482a/vaduzovagemebizit.pdfIn PDF document text
    • http://bakoca.hu/files/file/40331370563.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a055be3947a---50792293120.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/87a5a042e659e4373da94f3931823405/vudogejawed.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/88692231184.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/zuvuxukagazuxogaran.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6b05b7cbf---20881366137.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9134d9f803e483b89e79a0d7e7acfb3c/6712549612.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16075cb89f3748---posakad.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/83759113780.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/25453150024.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/wemigimipugejubufiwidobes.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/f02b417c14c4515143eba7e7e3dc8546/77247849515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=nordictrack+commercial+2950+manualPDF 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_off0000c6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CA 11076 bytes
SHA-256: d25d0684053e3fd628de42c85c064e87e1c42fc5ad1d223300a484e16fc1b0df
font_01_sfnt_off0000e0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BF 17620 bytes
SHA-256: bd9c7d1337ef9df14592b3d00e4e92cf38338011850104685ffbf8a432cbceea