Malicious PDF — malware analysis report

Static analysis result for SHA-256 c630dc827ad6d7f6…

MALICIOUS

PDF

83.9 KB Created: 2021-09-19 00:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 11ac6b3d96d08f36426b68fbda2c347d SHA-1: f259eef42c8f99d81a65ec959b4d21d29f86256a SHA-256: c630dc827ad6d7f69dc003df09a8e4ec3fbd7242fb2138f03e28700efd3aa0d2
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress upload directories. The presence of numerous links and the use of disposable hosting suggest an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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 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://oniceh.ru/uplcv?utm_term=what+do+you+do+with+spider+eyes+in+minecraft PDF link annotation
    • https://triatlonshop.cz/userfiles/file/63892589506.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/nokokorosupadazuw.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130edaea3ef4---93877705011.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210903120233_gdgvm8.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/41982021626.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/79366500624.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/mozegovofulojavu.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/zaluwiragelefubofi.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/rizirofusajuga.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613664460fcf3---saxunusarek.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/4b88147724e08ab40147059f643f06d3/43358437802.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/54544420247.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/5538154739.pdfIn PDF document text
    • https://durimawar.com/contents/files/45554334897.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/86336907615.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/65227474029.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/saxesojegudakodize.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/29565653295.pdfIn PDF document text
    • http://szm.hu/userfiles/file/33617745397.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/duzirapukopekaw.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1f7e463fe---todurelevev.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/xaluposupekapodunujenapo.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca32643d56---zubuf.pdfIn PDF document text
    • http://denge.aero/upload/files/bapagabar.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_off0000e221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE221 17560 bytes
SHA-256: c6778f31c5aca9eca3a3026d33be57182d85e478812ac820bbc916c892d38ad1
font_01_sfnt_off00010fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C5 11132 bytes
SHA-256: 106abedea42a119ff0378c844ee1ee11893a9ca3f2bc9e330432848000a56960

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