Malicious PDF — malware analysis report

Static analysis result for SHA-256 a144c3f23c258b4b…

MALICIOUS

PDF

68.5 KB Created: 2021-09-06 10:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 24c22572ba0520a2d738120fdd524f27 SHA-1: 865cb9e88887154f037ca02b7e25686d65b5bd41 SHA-256: a144c3f23c258b4b5d8c266e95920f754a97c75dd61a078c285449bd87ec1f50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised or disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to lure users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://proxus.nl/file/87133560794.pdf In PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609073145aacb---jigumobatuzejodavexij.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/91216712734.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/08-29-07-17-39-56.pdfIn PDF document text
    • http://diacritic.org/travel/app/webroot/img/files/werirogawopulaxezona.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/11164610768.pdfIn PDF document text
    • https://mavibusiness.it/file/jevofibibiz.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/55222554315.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607be32bb765d---19653583246.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/16040837728.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/diburitozanadudu.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c11e43fd3---wudolajufow.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be513c38c31---fataxosujadajetidalonited.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/59614688859.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161250ee8baf5d---tufurolupowijanikiwu.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/namukajotabevaxa.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d625a258c---91928684908.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/d7c44aeab9a2c05534ee1a834d309428/fofixagesuxun.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/13771763770.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/37808431117.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/salimamubetisibimojiruno.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/89725105626.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/bekebabazefilazobiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=trek+bicycle+repair+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_off0000aef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70B 10560 bytes
SHA-256: 3829ca791a17a1472ceefe6f0162442e4a8538b167663a90847797958e6600a1
font_02_sfnt_off0000ded8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 14552 bytes
SHA-256: 6e2ad371b41d39fa9ba669fff3681c6bfdef6e1e97df678214677e2ff8e878e6

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