Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd389a1320feb82…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 13:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e5f4fec65256868567f09c8d4acbd7c6 SHA-1: c737e03f59c86d0474ffe824f9fe3d8800171515 SHA-256: 3dd389a1320feb820b0e76437eeab81f012a4b07a0fca927558e07fe672c26a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or SEO manipulation. Although no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to malicious content, potentially exploiting vulnerabilities or delivering further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://erbamedica.org/userfiles/files/76491885417.pdf In PDF document text
    • http://asr-net.ru/uploads/files/61904671162.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/86716381019.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/sdp7d87tu7qjo1okg97t4nbm9v/serupedamojenukozukuvawo.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/30528048661.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/kawetobinovifi.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/vopefabunimi.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/67315210754.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a7db9e75c---devorigimavo.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/tupemakaloxov.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/53414211942.pdfIn PDF document text
    • http://matfreklam.com/calisma2/files/uploads/31658431020.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/kunilifanapodasolobimon.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160c188f216870---8850786383.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca31d0354a---rufokafojoke.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/tuwikumiluna.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/rabalovabozuj.pdfIn PDF document text
    • http://ahchala.com/img/file/petokilevizupuxag.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161160100356e6---49619071727.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/xitimaranekaminovunuwej.pdfIn PDF document text
    • http://teplospectr.ru/images/files/medawaperobugiwobukowu.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/viwadejukevusekajidur.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a875daa05b0---66734590113.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/7h69jvh11napa16m0vei47383m/nomozimazaj.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/edb75bb1c70aa254eb824dbba8304c4b/famatulip.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/xisiwinulakusajude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=schlage+keypad+locks+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_off0000d6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEC 17416 bytes
SHA-256: fa94f2128f60d612baefcc53766ed5cb009292db9274536a6ff862e6656b5437
font_02_sfnt_off00011c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C43 11052 bytes
SHA-256: 268f9ef5feff520ed7b31bd521cd7fa9fade90f31c7f6b2604f8a2737012cad3

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