Malicious PDF — malware analysis report

Static analysis result for SHA-256 806d2bff277b0ad2…

MALICIOUS

PDF

71.7 KB Created: 2021-08-14 04:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6b8801d72db09c67ae6f96a24d8794fe SHA-1: ef7a07d857138e1f874484e37b0b13c89e6dcc05 SHA-256: 806d2bff277b0ad25541932e7f2e2cacae49ab97a1110e41d232bec15a2ed075
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://dexgerm.com/data/file/userfiles/files/biletetabutu.pdf In PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f55752effe---suzuwomofubulibogifuja.pdfIn PDF document text
    • http://yuqiaohome.com/uploads//files/202108130355186459.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c6965975aa5---wogapakokag.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/livokevolik.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/73471040102.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fffe92c36---xogupujufekopokikosiwa.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/50971206712.pdfIn PDF document text
    • https://wavemed.it/wp-content/plugins/super-forms/uploads/php/files/9d9d04da20dd53260f923cb10a8a0dcb/jotezapibo.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/sisur.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/7lreqeqirrc0ln0a0mjav1kpfr/dizav.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/ec2bf5bf7ddd11bf09c31525c834d989/tuzigawefowuwasuzupene.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/dawasuxozereg.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c05313a75ac---banurakukuxomori.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/zutamikelufupugafawakixo.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/933786fa5b630bbdc8540a31a7eece95/zarizamenelukupozuno.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102b217ce747---89726120138.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8d36a1e22---58579587183.pdfIn PDF document text
    • http://yljx.cn/images/upload/File/5211481229.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c335123991---20642256401.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/87993664770.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/12e07c5990ad3fa047f1602d3d58ecf4/tawimedinitun.pdfIn PDF document text
    • http://fkhd.cz/data/img/58087771210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=verb+tenses+multiple+choice+test+pdfPDF 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_off0000b66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB66E 10932 bytes
SHA-256: 48aa92522b31c14e7a409dc83fcc1d395fb60aceb0af964b12ac2394ffa662f7
font_01_sfnt_off0000cf4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4F 15716 bytes
SHA-256: f4a4bfde32c471b8635840d384bda517b338561e88a3dc9dd5e587c236af34cb
font_02_sfnt_off0000f7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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