Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a6431a27313a6f4…

MALICIOUS

PDF

87.5 KB Created: 2021-07-25 06:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 14db1ded7ab7f06d2067624a36388294 SHA-1: bb2621b943bdd35b9c4de4007308ba37335b5993 SHA-256: 2a6431a27313a6f496e1d057a2b4a1896a3596067389b72588450d4b7c61f103
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The file contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads, suggesting an attempt to obscure the true destination. The presence of external URIs and a link farm indicates the primary purpose is to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://moyamoya.center/images/hand_uploaded/files/tekipaxojinizorijasid.pdf In PDF document text
    • http://xboxheerlen.nl/userfiles/file/64469544431.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd38177f56---ladupusufafovefaxobupife.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/f39f221c178ed3422e275c31211546ee/4181239050.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/lunodifujabofenitopo.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/66284e0fae12ada10ba04afa3b3812e5/31608995344.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c516d32732---zuvogi.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/77212758082.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/pematorelefeperimuduzuz.pdfIn PDF document text
    • http://holtfamilyreunion.com/clients/5/51/517903a0238f10651a3d170edcbd2d86/File/ramidimur.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/3114792612.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/vuzuvakuzi.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/bofopapapodana.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcafe8d5490---59551539508.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082466439648---kumususo.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/tozulefizetoba.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/lg7uv26v2hp8u9a650289ocg66/bigigafikawalo.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/04edfedc85d130ecbd6ab6600fd0e986/xaxanifetojoxixilaxe.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210615165246_la3upx.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b595342e13b---tazuvomajolozozuvaxuvujab.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e11a40f7d---robitipezazoguwazalibo.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d53f592f75---gexavolefadosowezevaw.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/a25160f81f365fae3ca61cc223bace9e/zarorofifaravop.pdfIn PDF document text
    • https://mmszke.hu/files/file/rubewezoxituxedapule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+create+salary+slipPDF 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_off0000f319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF319 17076 bytes
SHA-256: 5191f9519dcfbff40ccf0aa68fcff0fe86ef5327783712c3cc03e996dbb83ea5
font_01_sfnt_off00011fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CE 10452 bytes
SHA-256: 6b9a07c836eb4591f72e614c680b0de5c6ba9a989585764ffbb48601642ffdec

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