Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f164c272baeaae…

MALICIOUS

PDF

89.0 KB Created: 2021-08-26 04:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 05f88c746716eee501cf173e3270a2c8 SHA-1: 6914e042430fbdc14c8d68e2ccf18db7c077419c SHA-256: b4f164c272baeaae2e29bb919242543e0ed80036c0a1d94399cfd095bd973ca5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URI links and link farms indicates an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://pixomot.ru/uplcv?utm_term=alice+munro+the+love+of+a+good+woman+pdf PDF link annotation
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/5e2480c07bfaa0ee557ac31bead0a020/xowodipomawugazejowuki.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160b2156de54b3---zolejexowar.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/nugovigivufopovipa.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b0892675fc9---vujodojagawodoremevapozo.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/24331048216.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/vokajezulotadavafofozup.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/14664068810.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070c801cbdce---semelememetuwiwaxoxowazi.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/227e2f024b95af07e2e704c2e56ca163/34781595986.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/95320585533.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/53600303079.pdfIn PDF document text
    • https://fotovipvercelli.it/file/zewesoxaxek.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/kugefolosasanedevage.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/gawamaj.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/jikefanakejisupojewuwi.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/20346840902.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fe5e8e11e---73328146924.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/48114459453.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/189cf40d72eeac10134c88e0318c8e95/supumabegolafuketezawe.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e24a5dfe9---beboxomugolejinapu.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d3e848579---67817026975.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/6678f72ce53037d5f3c6a393d0168f74/24069086137.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16084f17f98c7d---renuvometuxiwofezoju.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2ca01aabe---gonifelaxiluredupivekufa.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/r42835e69qcaab6ic59sjfht4b/83961130077.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_off0000f567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF567 17620 bytes
SHA-256: 35c2337332c2d2301386b972c7ad2900fc7bb97a2f35c78511e0b4497b96ac7f
font_01_sfnt_off0001219b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B2 11132 bytes
SHA-256: 55d10842f3351b864e9d544d72126d364eda65f402cff8744e752cc232f08a03

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