Malicious PDF — malware analysis report

Static analysis result for SHA-256 233109ae7ae99da0…

MALICIOUS

PDF

80.9 KB Created: 2021-09-05 16:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 716178619488ab83380935c85148e0d0 SHA-1: 8b2efe6939f2ff2508c1e0e258cca3c74df8ff60 SHA-256: 233109ae7ae99da08d48e27c9a3263a1be92427f15c4c5e0aab5da216d130965
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, containing numerous URLs pointing to compromised WordPress sites and disposable domains, which are commonly used for phishing or distributing further malware. The presence of these links suggests the document's primary purpose is to lure users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://safarekhoob.ir/basefile/safarekhoobir/files/87455377114.pdf In PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/939f172e6e418e66eda544c7db3bff23/puvuselovawegokeme.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-7/20210507045133277818.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ubk2mei566k1vimttehkubd1v0/jarakaropifuwuwiwarekewa.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/src3i3qhivm791ikddvvk4hth1/26237488121.pdfIn PDF document text
    • https://wecareprogram.org/images/file/58051985489.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16090511631c6a---73747747546.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/liwubiwijuzemokovoxolani.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/98907362743.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/39811963181.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/djsb4juacfi47e1utl4red5ud3/55807450894.pdfIn PDF document text
    • http://garderoba.sk/images/_file/sodeboxadepujumijuru.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/jizorijujawuk.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/44215241231.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/nazux.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/21740272446.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/ebff678deff1dc1a412f80d4650480be/ropak.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/bugurefitevo.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/017ca5ba698420f7c79119c645af9c64/loxoratimuw.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c873f100d72---21809048221.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/11660155646.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/b85001f12733ae21356e19c35d2dce2e/xajarijewokavizukepop.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2feb72a36c---92488281809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=indirect+speech+to+direct+speech+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_off0000d20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20E 10460 bytes
SHA-256: 3e9ea6cbe1d013f13c089de77a31ab5c1a45c219976ca946dceb3c3ffb47f273
font_01_sfnt_off0000e9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BB 19992 bytes
SHA-256: fa7413a7a2a94bcf098efbdb4ada09d4f59045acaf7f2b92d43d65d20dcccb35

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