Malicious PDF — malware analysis report

Static analysis result for SHA-256 a325eda3c9765527…

MALICIOUS

PDF

84.3 KB Created: 2021-07-12 16:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 92f85bf1b6644604bd540d0b6de234ab SHA-1: 995f516068edf764228a59462a3f751dd0fd46f8 SHA-256: a325eda3c9765527554dd896f1c76bb7576ec6d95d60e8b96e2c2ccd2d9e5b05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting it's designed to lure users to malicious content. The heuristic firings confirm it functions as a link farm on disposable hosting, likely for distributing further malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://drafthe.ru/uplcv?utm_term=peptic+ulcer+disease+guidelines+2020 PDF link annotation
    • http://radio6deenero.com/uploaded/files/tixiturumolejowedadara.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/ab6d49fe43eb2831c92325bf71eb4097/10461316366.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/zumalinemidoziwesijo.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/5465481982.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/16424837218.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec6bc769e4---35133282560.pdfIn PDF document text
    • http://yarpaket.ru/userfiles/file/jijilufaburoveginev.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/caa1882e2da260142172bc101410d978/sabikomo.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/fogitarijuvaxunago.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/72021187602.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b360653c613---fufatuwirusaxotukafakeve.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f565f3253---16046906360.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/babalidudapevo.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/53370090587.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/77t4sa8ln41p5p9ru0v1s6ejoj/27774774752.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/sanawefuwiwimuxuxe.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/d8841a8979a9c010ba295dfaf42e53c3/suzudavab.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/vugopipopebetolamexozuti.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/jagolisufusinuzoziset.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa435be155---waditida.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/55107284757.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/d3357f2efbba096c226f93ff9e45f4ed/4107596540.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/tuwivanogimawuluxerore.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/74341367150.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_off0000e7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B5 16544 bytes
SHA-256: 3388bba8b32668b83ff307906773837f8e8b49f8c574e2a5338451245d804362
font_01_sfnt_off00011291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11291 10912 bytes
SHA-256: c159b49abdde733aabfbbc261ad5beec9ee2950b0990bd9c499382a0eeb51afb
font_02_sfnt_off00012bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1