Malicious PDF — malware analysis report

Static analysis result for SHA-256 13fa34340ef81289…

MALICIOUS

PDF

85.1 KB Created: 2021-07-13 14:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 04a553c10b769a0949723056aba398b8 SHA-1: 6941f02040aac433db1a8be4c06619650f6810cc SHA-256: 13fa34340ef81289d1297542dc3f4e1479007be2c35b78e2957607f6a945faec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload storage, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/52f21311c7c06f6f44b44cece38e5be3/11767939487.pdf In PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/36659526287.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/mikowuw.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a27272e681---rarireralox.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/bukij.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/37001819875.pdfIn PDF document text
    • http://nineslash.com/user_file/file/forokul.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/clpajbphr041ld7i2lfgn272pr/98649518138.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d41b9e4fb4---99630893864.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4982bdfce---dukaxoxasopom.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/0ab6754b021ab893260b4a98bdbc5263/83444725203.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52951107a---32361119301.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/vijiri.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/92383ea2c2b52d6b3ebdec4229825d82/48460714612.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/1c3cc4282c714dd3f060171b1ad041e1/9609181761.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/13063730494.pdfIn PDF document text
    • https://beaszemin.com/files/97837324776.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/6eku9gg1uau1rdb1kptl9gnvj2/89922192633.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/fibefasoxevofabo.pdfIn PDF document text
    • http://abpaluso.com/upload/file/71581118371.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/96760705803.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4e725ad84---77130834627.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/0d10180c0a62120ba2312cb9da35abbb/76902288395.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/leniwakajavewopekokamen.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/dulozufojazudaxaviw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+egg+andy+wierPDF 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_off0000eb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8F 17248 bytes
SHA-256: 7ea44454a86e4a5be7d74bdf34c98b2c1a3fea99a3767a82581ad607efbe577e
font_01_sfnt_off0001186c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186C 10256 bytes
SHA-256: b6722b2bd9d20c7069a4acdc36e502fff48c0907745917248931df4b4156ab37
font_02_sfnt_off00012f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1