Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8448b3bc3e432e…

MALICIOUS

PDF

97.2 KB Created: 2021-09-02 19:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 10daa0b94d4432438fffe372108a6c59 SHA-1: c4ec9e126bae111cbc0153588cd554943fb3bc47 SHA-256: 4d8448b3bc3e432e0338b51966cd0f2fde87c07e6ad18ec554e878080ab720ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9802

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 http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160739728cb04c---bawutumuloku.pdf In PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607623a104f99---sonugi.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/68858685099.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/9i6sb8bbgo3cke3oulks7cf4q5/79730119271.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086beaa4447a---48792884236.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/mawodoluridu.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/nimabavororimufirato.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/43627972323.pdfIn PDF document text
    • http://tdbm.vn/upload/files/59723657696.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d8c20fd4b---48934024878.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160795a0214d92---mamibebowovezubaregidiru.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/bcfeff829aec449238005f71c8dec8d3/wasagisovijotimuvosivit.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/67687686243.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a4148e473---87961178101.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/64181982150.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/wuzifupijubakewujisofo.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ada9c109fe4---50509889719.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a255aeb5492---xazodibopuzemedide.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/447b239303497a5ea8336a296c86a015/jerizofuzo.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/fekakefarugasexaz.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/befewevugavobajenelanum.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/71368551644.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/186861198.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f051e6e5cb---73294754886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ronelle+alexander+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE823 16532 bytes
SHA-256: 0bb8a8cd9a0924c4275f0c0189b222e873207a184779b993ba5936a90339a836
font_01_sfnt_off0000ff57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF57 10280 bytes
SHA-256: 04590739b3a1392b174ca9fdbe81fcab70af3af07560e2992351598dd696e514
font_02_sfnt_off0001168b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168B 1840 bytes
SHA-256: e11639021ae82bc81d66597892112dbefd7f2cb67f426bbebb6fc3c29591e729
font_03_sfnt_off00011f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2E 24192 bytes
SHA-256: cc20836b2246cd18186ea268f64c71a1f157f87eb2025b2a3dafede7e493b298
font_04_sfnt_off00015c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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