Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3061edba67d054…

MALICIOUS

PDF

86.9 KB Created: 2021-08-03 06:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f5d957867cbcfdcebbd603faca4524b4 SHA-1: f3e957d17106a98df19ef6a8a65d6ddd6eb8f48c SHA-256: 2a3061edba67d0540b1750810625cd7566b296c866ea9a875e35b6bd4a5d173e
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, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The presence of these links and the overall structure indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160975450b1e47---16788819608.pdf In PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/bvo1jhrhcqg0u2p1tc2t3ed37s/lufenubutesujo.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/0f35d07c9b7741f5d0531f0c9cafb1d1/bogilopivoru.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/71310299661.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210620020520.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/14988008329.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/vosojufapigozezajaze.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7038548b84---zudedativid.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1eippnqr7k9q9fps5otdllgv25/37498206096.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/dovowizenedunal.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/85531418676.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/5f8ea4b51357396f25f3298b7b024da4/nimogikobojemafizebid.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d04d68618a---38939532136.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/kugova.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160866dd316216---kidadivodigosasasusado.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/zamoremixewelakukukar.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/pupebudamekote.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/49643924076.pdfIn PDF document text
    • http://builderall.info/userfiles/file/61897975104.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/kijuxabanupodi.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/97670469559.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/fologakarupe.pdfIn PDF document text
    • https://aeap.com.br/ckfinder/userfiles/files/88627741450.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52749157923.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c46f4f7574d1f787bb897ac4901bcc71/koxoxolitijozazijumomaxab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+use+a+tower+air+fryer+ovenPDF 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_off0000f061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF061 17096 bytes
SHA-256: d639cab328d910aecd292bc6ce8aef5bcd943fcd0f5d764afc1b004dae08b8f2
font_01_sfnt_off00011ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FD 10520 bytes
SHA-256: ef35e60a7d9d76f44f32df2a858008c8692bd04f9d4ec21f3d5ab3e667cdf738

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