Malicious PDF — malware analysis report

Static analysis result for SHA-256 77079bf056bbfa88…

MALICIOUS

PDF

76.4 KB Created: 2021-07-20 22:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5ff9f14996463f6e974a716776698221 SHA-1: 485f17ca9e22529ddbeb26f3d3e33db155f0e636 SHA-256: 77079bf056bbfa882830cbbfdb3a1d2268afd65cf8b0f77cddf538e7fb84fcb1
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/9d5a3a6a4eed17bb60badda07cc152ae/sabibulixeg.pdf In PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/fa362e674d9f0efe1f1b32f2c312834f/40971352416.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb9e257a91---69774543518.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/gqm6ouae399tb48mhn9fg1d3of/51272638503.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ed5d3448d---25748915598.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/d7bc527dc05282fa1cc2f5afe2e16eee/49892179741.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/tirasitiki.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/68603597232.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd182e0ad0---kedele.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743289c9aed---xorizan.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/15304943527.pdfIn PDF document text
    • https://nadamasristorante.it/file/3265024696.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/54308b3d462c8581eb960b3fa149e8bd/ridavanugusukukeretuz.pdfIn PDF document text
    • http://mrsjamesirvine.com/clients/82887/File/84571854796.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d8ca64767328e1473579bd3aa908d57a/kidukukubesoxox.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/23297885871.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/kemuwatu.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/vorupe.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/vogam.pdfIn PDF document text
    • http://castanienfamily.com/clients/74558/File/zipokowazivupatebanupu.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/66867092387.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/istrd1drtr9684shhegdre0356/xafarewovafidekapital.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a27633358bd---porofajulu.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6e2555490---pugej.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/wuwabulelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=minecraft+airport+control+towerPDF 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_off0000c797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC797 16656 bytes
SHA-256: b23f4448be7488476c7a19847eaff03f7e669c01eb2bf98f5a1e538dd2234740
font_01_sfnt_off0000f320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF320 10384 bytes
SHA-256: 0ea90f9e1b20125d22d2c407b7bcc69ca9357a3698f47ba07694bc96a05c5edf
font_02_sfnt_off00010aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1