Malicious PDF — malware analysis report

Static analysis result for SHA-256 875d556f60fff524…

MALICIOUS

PDF

104.1 KB Created: 2021-07-06 14:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 619e60fb88de63240418ac46bde1ac2f SHA-1: 994634c568f44e7f55e082864cae8fae386e1d46 SHA-256: 875d556f60fff524c3ec52cd0d9fd9e89c2c99af4212c72a50b31b9519a5e244
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised WordPress installations. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, suggests potential for further malicious actions like downloading second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://bezagsecurity.cz/userfiles/nikabaxoligomimafatu.pdf In PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/8eac3a617ec8b064117b2871a5acce23/gasemalobasavafewuk.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/d9d7d87f3252b6271ad72ccc6283645d/zexafemebimi.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021062910354773499.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/41410242509.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d5b5409f---78857961882.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f1aed47aabe08315b114e65ceb098c60/fomomutikisa.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609895599f756---3613383510.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/49937794450.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/83ggt0h7opkt4dl9cj29bos0q2/feboseposuxajevenefuv.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa090e563ab---dizetukolevatuveralato.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/jukaronugunig.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730be4e5aaa---xexasepol.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/f7a3a5b4b1487841068e1b5261b0ade9/8230278950.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/10110415081.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/23457570001.pdfIn PDF document text
    • https://nasikampung.info/contents//files/66846825474.pdfIn PDF document text
    • https://unosms.us/userfiles/file/josavixubak.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b624337b37---dumudaro.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/41b15e364cb17dce52ab53e0098f9580/39666608273.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58173580553.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160afdfd9046ee---45347768730.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/nepovexaguloxeti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=consumption+meaning+in+tamil+examplesPDF 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_off00013a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2F 15664 bytes
SHA-256: d56e414523c679fd59892994193209e5ece6356da065588beb86c299208d57d6
font_01_sfnt_off0001623a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1623A 10728 bytes
SHA-256: 4191cfd81cd43475acd6c284dbb12979423971151d237bca030f3bab41d22d35
font_02_sfnt_off00017aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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