Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e12ac93d7aaab70…

MALICIOUS

PDF

80.3 KB Created: 2021-09-16 23:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eaa48f2a64347ec892b7c9cbebc204c8 SHA-1: ae9c4aa19ec022c816b51ab5e69b7ecb1169748d SHA-256: 7e12ac93d7aaab7011e8adc0a9069bba1c8c425750ce49a2a9b237ec14e1f5db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=my+hero+academia+season+1+episode+1 PDF link annotation
    • https://natinsel.com/imagenes/file/sidowoloxukuledadomi.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e59a5824f---62076765330.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090705044273499.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/77364614955.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/62849221522.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/jinulutevewobonufukezub.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/38336619707.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/97274621216.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/javuzi.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/fuvulelokim.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/10757243816.pdfIn PDF document text
    • http://thongthien.vn/upload/files/16977271354.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/99387485830.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/2317562653.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/99022363460.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/b10499ff97987d986077f3452fda7ad4/943176808.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/70926517009.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/posepomodekeketatu.pdfIn PDF document text
    • http://innotack.com/userfiles/file/xodozagex.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161323ba19ecdb---funamalezep.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/37004294131.pdfIn PDF document text
    • http://w-mill.jp/images/file/wumuvonadumarusad.pdfIn PDF document text
    • https://huanghecables.com/d/files/26437574374.pdfIn PDF document text
    • 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_off0000d1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AC 10792 bytes
SHA-256: c21bd0f2732a140e386a7288dab4901276a6090e5919086f56bf98c786c191c9
font_01_sfnt_off0000ea62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA62 18804 bytes
SHA-256: 040439fc5fd31fdd0fca21e1be3cf20ee3fb3d09916a69ab0fbee393160d2c68
font_02_sfnt_off00011b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1