Malicious PDF — malware analysis report

Static analysis result for SHA-256 7604fa5d13df8c84…

MALICIOUS

PDF

86.1 KB Created: 2021-09-05 20:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 67cc6e4aa9d66b5460f0b3d08a1c66e5 SHA-1: 3f03ae36f8218daf2a500c0a3132805a7d0e4068 SHA-256: 7604fa5d13df8c84cfa0726c9dda6014afa1d90a8f8e8e5a0eba3fe011e5592a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous links pointing to potentially compromised WordPress upload directories and disposable hosting suggests a link farm designed to obscure the ultimate destination, likely a phishing or malware distribution site. ClamAV and ML classifiers strongly indicate malicious intent, specifically phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a3f6d562a2---61314337865.pdf In PDF document text
    • http://machinesupplier.cn/data/product/file/2021825_44429_489.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/tufosigababudelukuzim.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/rixakawesunanajalow.pdfIn PDF document text
    • http://fvhs1970.com/clients/876770/File/manovexaxegupunowife.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/gifakov.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/resapuruza.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/gevuvobezetatutil.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/98116207121.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/b5e927283fd427a987de19d247a6519f/nanebus.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/77eugl6or8hr93uhlog8lfvih9/50615898202.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/jebinolinano.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b807b35042---mobewijuwumuzijipomimakop.pdfIn PDF document text
    • http://poorclarescork.ie/images/41051626057.pdfIn PDF document text
    • http://smartcevent.com/clients/871459/File/34887843758.pdfIn PDF document text
    • http://topp.pl/_topp/file/91427367286.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/45b42a25e905a469978471d2d9138d72/65477492634.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/69177420694.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/60914918718.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/j005b0aessgapos33agh6vg9e4/68926514779.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc4586c9b73---davelefamunazefusiw.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6ace63fb1---soginetabudon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=glittering+images+camille+paglia+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_off0000e93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001014d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014D 18644 bytes
SHA-256: d60bc59bf18dc91e7d9e89e97a982cf9e6bd76fa68400d606a24f880220e1804
font_02_sfnt_off00013173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13173 10880 bytes
SHA-256: 4d64e4897deaa6d74613b5951c4f7f0be162237ffd0daa3e9b7049c26df29666

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