Malicious PDF — malware analysis report

Static analysis result for SHA-256 c60513b3b64b50ad…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 16:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 573d2a0910eb3a13305f8b8af4326cff SHA-1: 4b08a1967276da2e1bafe6f82f3d13ac72aaa253 SHA-256: c60513b3b64b50ad0369cd749839cb222d44d06d33a16c2dca3f58613470c8a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous PDFs hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and link farms indicates a multi-stage attack, likely involving redirection to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1612066ff7f5bc---kawugozerobod.pdf In PDF document text
    • http://anthonyvienna.com/sites/default/files/file/46403096518.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/vapatenugitowevubosa.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796b6259df3---lorojejajesutozokemujuf.pdfIn PDF document text
    • https://htchninc.com/d/files/9189953191.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6cd97b565---vukosebiz.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/35637686694.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/82354354089.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/45395002061.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/55957291263.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/19732398827.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075a93b5152a---30832373462.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/gekisapewapaza.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/67503942863.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/87620920028.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e9b09b511---62453085807.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16084999a7c515---58861480419.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/537d157ef3d3bda233c02bff42499970/bemiwi.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/gefabeterexewifapijub.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16083f7b062535---wuxudomotim.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ae395474105---lekuvumejulowoluzin.pdfIn PDF document text
    • https://ville-rouillac.fr/docs/file/15151219643.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/davokakojevuwogejumojo.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/3vhrkmhm9sv26h6ghq46b30hhv/67436063759.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6effda2c2---23539411862.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/hr2f8d8hm3jst2rk1v4duo3m10/vomokubojiborosibafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=fractura+de+perone+rehabilitacion+pdfPDF 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_off0000dcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB0 10768 bytes
SHA-256: 8c22d295d4ed9deb6c3a4d31609ce156450c2433ba0e5a879c197f35900911b7
font_01_sfnt_off0000f511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF511 17836 bytes
SHA-256: 747aefa29572b0617df0adc92db87da878a28d6e22ae273453cd235fcff7e0a2
font_02_sfnt_off00012286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12286 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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