Malicious PDF — malware analysis report

Static analysis result for SHA-256 872902180e7e5ec8…

MALICIOUS

PDF

70.8 KB Created: 2021-09-02 21:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1b403bb3c587470392abd06239780ee6 SHA-1: 4324f5fb4df6c6b32e9efaf7bed412eff2cacd64 SHA-256: 872902180e7e5ec8a62f3cb40fa5503cd23b034df62b8318853e4ba9e487450a
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. It contains embedded JavaScript and is structured as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used for phishing or distributing further malware. The PDF's small size and image-heavy content are typical of lures designed to trick users into clicking through to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160abb11f4fb28---dutabopozegepigukudoxa.pdf In PDF document text
    • http://greece-ex.com/images/blog//file/53024464213.pdfIn PDF document text
    • https://globalquestconsulting.com/userfiles/files/vewipapaxiborobaxipeva.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/74211976902.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608dade8ede82---80745901945.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7a62d0fc49004e01e8a60a83d184e4ce/29491626875.pdfIn PDF document text
    • https://papiratisk.cz/soubory/34513020290.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/98836842233.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/kepomur.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/doselofadasila.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/18390470278.pdfIn PDF document text
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/fawerujumeritiribu.pdfIn PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/42187331952.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/52d5e01e56906412ccb5b98c48e90243/1590523298.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161245e7edae47---45910554943.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/xaduvijedak.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210719_A011C3186B450728.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7003740c9---fejer.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/ukm4osvcph6k5bhlf71etm1q5h/57998055965.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/600116d24af14c78159acd454834377f/66686300333.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/14576153324.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/361fde9ee139f9a13bb7c0843606c2f6/71559885135.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/89927292753.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d96f34f2e0f---58460285675.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/rizodiku.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/rediruloxagaxasasato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=akrong+core+mathematics+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_off0000b8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E9 13960 bytes
SHA-256: 037c5031d31bb55816992be47de79912005cc964013fb703c7c9bdd5d1244ecf
font_01_sfnt_off0000db46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB46 11092 bytes
SHA-256: aeb61b56fdf0e1f5c443df59f28bb5d4c9ee83addf9697bed5ee22fced28df5c
font_02_sfnt_off0000f4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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