Malicious PDF — malware analysis report

Static analysis result for SHA-256 8caa0253d6f8aba3…

MALICIOUS

PDF

72.6 KB Created: 2021-07-16 03:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0d357026fcb18c7a5b491c1978818f71 SHA-1: 386d9c5199f16bc7978f174778a1e980df69ec25 SHA-256: 8caa0253d6f8aba38a897152e81881d72c9c02e41962263ea54788787beb455c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns suggest it functions as a link farm to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pokemom2.com/uploads/files/46313954109.pdf In PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b738296fd83---manokiziwanefik.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/gusik.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/92191179220.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/qmc24muc4i15re40gfra8p0s2s/jubugojenewodowenobakij.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607089520e8e3---72022557739.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/c79fe7eb3ab2c0a0ddedd56208af4b10/bonogadasulogovirakodin.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4db2296bd---sigokulepimozedezamos.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ent48m6ko2688ltkt2e206avcf/japemudufuvivuvo.pdfIn PDF document text
    • http://skyfestival.kr/ckfinder/userfiles/files/86647653444.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2605625525---47336388988.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b57b0cce7d2---xodatijepomuko.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/avo3fp6l6ghaijuf7r09vjqhj6/94265439989.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/19409951702.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/neritodemasi.pdfIn PDF document text
    • http://womenscouncildallasarboretum.org/clients/85748/File/57415366307.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/58226135586.pdfIn PDF document text
    • https://ka-base.no/images_content/file/28111849128.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/pasisamisevapavaki.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/texijo.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160802ddfd331b---boguv.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/72351344444.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210605_B8AE9E9E885C3F9D.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/bc482d34c8422f2a074910817525768c/rowovigovamodikilopor.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/4bcb30b07c086f9e67c7bea93886cee5/semuzazapetijuwaxagugoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=successful+writing+by+virginia+evansPDF 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_off0000bb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB16 15564 bytes
SHA-256: c050da943a20ee2c22da344542b05ee260baca6010592141216100ff1c8fa909
font_01_sfnt_off0000e317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2E 10972 bytes
SHA-256: fa5d75a2e891c622aa1bdedfca8f78fb62c62e665a3bb59469b80bb5dac1f66a