Malicious PDF — malware analysis report

Static analysis result for SHA-256 30578c8845670f1c…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 06:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d2896ecfc831e425015dc754a1d502d5 SHA-1: cd5be692eef40801788e471ccb171c151a0fb484 SHA-256: 30578c8845670f1ce0fca555089beb6dcf83bd3561c17f97c655ccd9ef9d6b17
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also functions as a link farm, directing users to numerous external URLs hosted on compromised websites and disposable domains. These elements strongly suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=mcqs+on+research+methodology+with+answers PDF link annotation
    • http://nowator-zpu.pl/userfiles/file/kikewefijutubanuvas.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/306846808c624040ad7aca3c8512a5dc/zakerekexakek.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacb5395d03---gagodedivejudogubi.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/622a19a806d84babdec628b9b0e41979/fisijajinevisurenubogem.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/jaras.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/59477150653.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/31961537758.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612522da702d9---lisulivubibil.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/82637432054.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/0ac5ed09148438c0fbd17e02c0ad2381/puvisikedapob.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cafd12e582e---roxoxana.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717b2a32aeb---ripivesawadulonumi.pdfIn PDF document text
    • https://rjpexport.com/files/73122011056.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/f37n7ak4nqsclbrsuov2p26ns9/bamalabim.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/zatigekunutizuw.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/1obr2jaac8c6aeppscjs76oa60/17285463089.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075888c42485---xaxebilubiwisaxok.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/duxivujibuxavozadilan.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/3884261505.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/38230916086.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-5/20210505123100163897.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611142b6d1551---segakaf.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/vixodu.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729b7820055---82041697282.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_off0000e043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE043 11156 bytes
SHA-256: 6239437b8aa1671d3b979139667015343b25a3cee7f08a449a74e3829e4fd100
font_01_sfnt_off0000f9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B0 17720 bytes
SHA-256: 06d1781252a3735a55835d5af259722130ed75c47ad62862d2fc1b1adbfc372d
font_02_sfnt_off000127c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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