Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff1ca478bc7ea08…

MALICIOUS

PDF

75.6 KB Created: 2021-09-04 22:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 528cb4b044673f6d6d542ad2308dd39d SHA-1: 4e00aa6ad9c5e7c366d9b1f9219378dc8a6d8c0a SHA-256: 9ff1ca478bc7ea0848a1b95a5a374843348d1b1464d88d97dcea90511f6a797f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what the heuristics suggest.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825444b47fb---sumunugezukupuzizoseka.pdf In PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607050faa238a---gaxakejumevu.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd9ef5dbbc---dokifagirobasude.pdfIn PDF document text
    • http://thehigh86.com/clients/13680/File/kituxiwagubojonolego.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/bf23cf69d59c8acd7db7e2fa2d78e9dc/rigakumovadejusil.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/f23c26109a084f1f69b3df8d5d74e6b1/sefonukaputu.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610678bb7926b---vujikogidajo.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/jarebudix.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bb55552f3fd---68667078448.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608efed386dbb---20108698763.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610ef15208b90---vonegiduvanog.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/6c3423c1afc126c9f85a3678b39521e8/zitebidefexamagokimijezej.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/nevijexe.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/42455204980.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/85923438528.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/debev.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/zamiruxopoz.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/majatajewezi.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/48821280565.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/taveroleledefunolopo.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/23754063710.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/lpreq73nf55skp9q5rh31mk2qv/rarogikejobanawunan.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6a9d00c47---rowejekugola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=rq8+strapping+machine+manualPDF 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_off0000c5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE1 11200 bytes
SHA-256: d9f68eec8c37e5be846489fa6c6074a413f9774671e2791ba9258bb5d6e1546e
font_02_sfnt_off0000f797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF797 16300 bytes
SHA-256: 8923d0253215d75a9e773ff3f83a3b907434982025e0c02a7f455c2a165d3cf3

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