Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa5caa641524902…

MALICIOUS

PDF

71.3 KB Created: 2021-09-10 10:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 292f78679b2df2e5a2670f3e03b8414e SHA-1: 502db9f3ddcf643c247baa837e75e99132a64e96 SHA-256: 2aa5caa641524902b3fadc07fa5827653aa8cf714071f5e2d0060f795a5c9eb7
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links to compromised websites, suggesting it is used to redirect users to phishing or malware hosting sites. The presence of algorithmically generated URLs and links to compromised WordPress uploads points to a campaign focused on distributing malicious content through deceptive means.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://catamma.ru/uplcv?utm_term=positive+adjectives+that+start+with+the+letter+b PDF link annotation
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/b481636430bcdccb2d9ee6ba40d8eec8/56133844233.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136177e11b20---jesolapu.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/gijutotezavebu.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/95539789195.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/somulezodokule.pdfIn PDF document text
    • http://sdds.be/userfiles/file/76836722583.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/44517667457.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/bovit.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109010546146876.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/konotapetavewafi.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/lexezizifovosug.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161330428b8c23---17206338527.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/51651024858.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/42682390730.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/66171636148.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/50581546380.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/89813160324.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/28875269283.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/bozagewugobowitavudimovek.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161331d49276e6---62139449621.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/gixozaruji.pdfIn PDF document text
    • http://nemochem.cn/upload/files/dujipowesi.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/41962161503.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/zixukaxijameboveketuka.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_off0000b6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E0 10788 bytes
SHA-256: 7129ebc6df3c353f51c1069d27b8ea1ead5b01563315c626ff45267b5a6699b1
font_01_sfnt_off0000cfe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE5 15576 bytes
SHA-256: 7b14d5c4e0ffc4c875b43ab8f92764aa8445217c4f3b8eeacceef8d56641f0d4
font_02_sfnt_off0000f778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF778 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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