Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17adbd756fbe29e…

MALICIOUS

PDF

76.5 KB Created: 2021-09-11 13:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6e1fe82a272b3b1ed007131eb025f4f3 SHA-1: 9855c25708f4d45c5487bc00d5d70fb8d7e663ec SHA-256: c17adbd756fbe29e407a4f9bead27c78f34cf89792d163ff24054e119d957af2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of JavaScript suggests an attempt to execute code, likely to download further payloads or redirect the user to phishing sites, as indicated by the URLs containing terms like 'photoshop pro torrent'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://oniceh.ru/uplcv?utm_term=photoshop+pro+torrent PDF link annotation
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a666dcb669---wolufidipurofoze.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/35397774592.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/27544773036.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/bubibesosug.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/pazorevubenozufufepamoba.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/penesatu.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/88736260814.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131ba0d8341d---zulaf.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/xasolagomipifonu.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/numivu.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/96641292704.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/2daaa71a72afbac6a1d582190c46a76a/zotufogirazemuvita.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/38149549372.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/56040086122.pdfIn PDF document text
    • https://dm288.com/slicice/file/dexaxijug.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/52204148595.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/wagusolepaweba.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/gaxibovepog.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/91432958774.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/rewupogepo.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/robasinifipepuximiw.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/bogukirim.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/69944754397.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/29696163589.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_off0000c88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A1 17400 bytes
SHA-256: 1c93666dd0e8991ee3235e3258e7e01e065f02f34507bf6870ebd21ee0de4a11
font_02_sfnt_off00010e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1C 10048 bytes
SHA-256: fe0793ba526bdfdf4486438792bd4e135ef7bec50c76c95683280f7e03b55ece

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