Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ea7991c30f100f…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 14:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 749101fac940b86153be877ac002cb52 SHA-1: 12bd4478e1d6ca05d82630b8b4bbb933e717e697 SHA-256: b6ea7991c30f100f3bf85ae5e3a55d13230193c92afe1464b6aee8191ad866bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised websites, likely to facilitate phishing attacks or distribute further malware. The presence of external URI heuristics and link farm indicators strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/18tu0ek93dabpfn1i2ah1rfcvc/18931430344.pdf In PDF document text
    • http://hurtmar.pl/Upload/file/5161421478.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/0c67ae999acc75ccd93efb8a6cdb8c97/gokaxu.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/831103bf04591bc2f6df04580177985c/lavegog.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/83658252264.pdfIn PDF document text
    • http://voijin.com/userfiles/files/24541508526.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609306da22794---97588592842.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606d42d8e441e---12877451204.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/44450839777.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/50348372417.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f7e2b00758f---69084862888.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/fff5fd02e16c94341d4249b64ecfba78/sesupuvipixogo.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/kemezukijowoditiga.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/92816585721.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/wonufekaraluviju.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e604abb52---juvikumezomapu.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/jexukevomobulixezumap.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/q6nhrt4l84e0gqo0sbdt54ntq7/92318733960.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/eafc8a855d43f309e45672b97f808dd4/16483943376.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/lajux.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d39e5e6f8c---55029846313.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f66fab009f---kavixebinewufo.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609985efc1b98---74318812408.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/bosibeba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=free+sewing+patterns+pdfPDF 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_off0000e1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D7 16036 bytes
SHA-256: e9338e17774438b9bdef9232fd4149e08e073e7ca6be1e42357d688573f79401
font_02_sfnt_off0001230a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230A 10568 bytes
SHA-256: a8cfc1c3c3ce159eb21774b1d32e34fc3a685bea522507a7aad598f8eeeacb78