Malicious PDF — malware analysis report

Static analysis result for SHA-256 0579c99df57b082c…

MALICIOUS

PDF

104.4 KB Created: 2021-08-06 20:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 097019d373c5fa1aec7d9122164f4c1c SHA-1: 4c7dc708fa2a2ccac881f17e458769f8f00eb8b9 SHA-256: 0579c99df57b082c6c75d0b55940d3cb1fffd0e35bc25893c155b572c30433d2
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Numerous embedded URLs were found, with several pointing to compromised WordPress upload directories, indicating a phishing or redirection attempt. The document body was unreadable, but the heuristics strongly suggest a malicious link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://sbsoftware.ro/admin/userfiles/file/96202263018.pdf In PDF document text
    • http://driver-jazda.pl/upload/file/tazujuluxoputimoma.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609870fc9a3d8---bosuw.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6bdeba90a---wofukamividineduduz.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/24533163239.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/40294509055.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/6933199088.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/gugulujivolilat.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/wubegijawepanixo.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfc0b3fb51---xefit.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b52e11cf7d---48808887000.pdfIn PDF document text
    • https://moscowfashion.net/content/xuploadimages/file/mamekurabidijij.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/62506h0lf5mvn9uddkn5e4aten/17398090096.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1c398594a---26085390308.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/drf36ce8j3p32i829ej6mhpu20/gojake.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/pozujafijeseresu.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/fac7752ae72adc0d1dd95022c3f4937c/bofotanepuwuximipidazipa.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/35eaebc921b638e39ce0ec2752e46488/jusepemepej.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/bapijaginikuseke.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/bipumagagon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=tassonomia+nanda+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_off000131b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B5 19368 bytes
SHA-256: c081860be0d83c1a1064b02c3009878976074de5292269d4e413dda102c5e8d1
font_01_sfnt_off0001639f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1639F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BB6 10248 bytes
SHA-256: 409ea93e89eca4638be35e581b47a46de3cb4f3a53a39d39930b701bfe18f8a3