Malicious PDF — malware analysis report

Static analysis result for SHA-256 769e9cf2e72b969d…

MALICIOUS

PDF

83.6 KB Created: 2021-09-10 07:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a70cf9f56f936674364efac445f56121 SHA-1: 0ee0e49d9d762facb66a3cf10f353aa33d3b4e9c SHA-256: 769e9cf2e72b969d5b4996c8451bedc60ab00066434bc3d31d1814ccd621fbb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://medvor.ru/uplcv?utm_term=how+to+block+websites+permanently+on+android PDF link annotation
    • http://lycee-elm.org/userfiles/file/vemivukodupefojetepawel.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/kidivemijavekedevudajamud.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/lozuvaramuroworete.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/refovalapibafapoweded.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/7974471984.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/pagixem.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/zesekatomo.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/a5hn50pjbod5kugkdbokjoitv1/fiwofoxegibuvati.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/74638388737.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/60654878979.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/61290129106.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd82031ce---19082925578.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/3832857763.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/42850033042.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/vbliodoqlkdjf2rd7rpuod5h8u/kawunusid.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/wufasebegopedagebik.pdfIn PDF document text
    • https://sergiomauri.com/images/file/35465372081.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/62578332165.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/zemoranoxarujopetuf.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/18261136042.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/tinugibibakazoneturum.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109080050056364.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/dedalapuwutusa.pdfIn PDF document text
    • https://vleek.com/uploads/files/nerexal.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/30410362399.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/94696192343.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/33341460016.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_off0000e104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE104 17424 bytes
SHA-256: 1c19eef4c6270ee582468aa5e4aecba4723a429b68a46c0da5e10a55fd8ec7e5
font_01_sfnt_off00010e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12658 11100 bytes
SHA-256: d34b685db8839317f521e7e12778284def35ed3d4f96914b53a7a77d9584f702

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