Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f6c42b9ef36f596…

MALICIOUS

PDF

71.2 KB Created: 2021-09-19 05:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 54a319a485efc5927bb6c7a9afab3e08 SHA-1: c7a61ca81a52eb465492c961282920d6c6993aba SHA-256: 0f6c42b9ef36f596afcc3b13573256e36e03d863addfd95e2016e69aa512fbd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to leverage external resources for attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad529af966---pokexewelixujo.pdf In PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1613a11477ed46---nulenewajigutu.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/506c4dcdaa16c3f59b1407b6725d3f11/dulexanorinizori.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/5715262356.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/44967140036.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/48676987672.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/86638117943.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/zarizudukupumubitazowa.pdfIn PDF document text
    • http://protok.pro/upload/files/zaxanolokifizoba.pdfIn PDF document text
    • http://chipgene.com/image/files/20210903_155002.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/33727207751.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/26400008667.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/75305582991.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/migubap.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/82113023869.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/59241706892.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/81001945183.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/49404335041.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/kanudisexujenisewu.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/54924663659.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a613e73df---97777058625.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/gazibokidadowedawozopezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=animal+farm+pdf+chapter+7PDF 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_off0000b867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB867 15380 bytes
SHA-256: 85eadca3f4cd2e40b901a93e8effed48cf57c99c97f73ff7f26be0b7216dd744
font_01_sfnt_off0000df33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF33 10628 bytes
SHA-256: a7420ab70a60dc6d98de0a7e6766ea3d1c5f601c888a595e14fa2f6116e906c7
font_02_sfnt_off0000f74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1