Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c6102baae81524…

MALICIOUS

PDF

99.9 KB Created: 2021-08-05 23:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7dae5e0e71e471c8bc924511562235ad SHA-1: 341b8dae996547c5ff5b74fe0a6a16a2e0fd6c3a SHA-256: 72c6102baae81524607a232416c5de4ddb35bf05b212214bc03e5a30955b4825
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=what+are+the+safety+precautions+in+assembling+a+computer+unit PDF link annotation
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/lomivimoxezemunejunaj.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/poridulugim.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/lph472cd5l5qphnnf3vo1d6kil/83101520841.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609949fb8ec62---rulunupisosidutaferamid.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/45550618271.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-8-4/20210804135254941986.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160923b8d51015---79639864332.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/eehnsabo83nkfjgammufhraeni/fitozederurijekob.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/irrtf4uvorvcehvuljqse61fck/raviwadarorolep.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f217b55701---fujesulokitodivum.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/kidaser.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ffbae740e06---61515615557.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/5219c248cd08b35dabd3340917d7b839/41864979825.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/a8896jd9r331ut3fir61h5n92i/tikopibunakixukupuwiz.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3d382a7e99d854a7caa1cd6e24be2ee7/sawinafiluvuzifada.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/74527818561.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/jomanowodelovunimivo.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/62137273154.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3aa36fa92---pibitosejozada.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/fac3269eaa9851e567feda2932960d73/45240457321.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/abd5415bcb568dd2c30495507aaf0a99/dazikiwatavivib.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/majajodumebibewonanoxikib.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/g2i6vprgucl08hqeup3nfgjtj6/wabodizaxesasaku.pdfIn PDF document text
    • http://limoride.net/gallery/file/68794734841.pdfIn PDF document text
    • 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_off000122a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABA 11272 bytes
SHA-256: 3a0696176825dec4ab6ece01de74b1d246cf79b936ce00134e2853c13d4d985e
font_02_sfnt_off000154d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154D2 16808 bytes
SHA-256: 913e956f2826da583d4d96cf1c8c14aedc9a373aa181664b51d854cec964c45a