Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af49ada75acd45d…

MALICIOUS

PDF

89.0 KB Created: 2021-06-28 01:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7c23fd334cdaef2ffb7bd607ddf70ffd SHA-1: 284adc2304757292f023269b70362a3f8f471905 SHA-256: 7af49ada75acd45df41e8fc696abb31073e174bb1a760bb987384fff0b5fd525
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress sites. These sites, in turn, host further PDF files, suggesting a multi-stage redirection or download process. The presence of embedded URLs and the nature of the link farm point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/7b4kmr2urs3ee260hdkcbmngd0/33201402725.pdf In PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2e5247597---giredopovokiwerog.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a17014ba7---64223508297.pdfIn PDF document text
    • http://garderoba.sk/images/_file/30747469535.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/ss63qtmdgvra90dfnp3c3okrat/sopefejigumile.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1bced34c4---gogogozofexudasexonu.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/bc8f2af2048bb520b671850463c71c39/55920785672.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/74466737f4cf59a8ac61556b8d63b04a/waboxonejanab.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/11c497ba6d901ac9bff36aa66b01d863/17704634192.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076e9b7a830d---72727660370.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/22831277958.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/36938202723.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/pufose.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/rs4u8lui20dc5kjbs3i24ouhm5/sexawojow.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/urbmd6654r02voo64k8csrvamj/33368402590.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/6885651100.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/495ef4ea07c3697c19b31c29060d46c9/30010926845.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/68365709393.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fc146a138---pudigituzesuperixox.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/rijerijipilojibid.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/a693570a1da709ce3f0bacf933e112fc/15475926720.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/58230682048.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/bexulepozagepezaruzexal.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/b9356b2549d48c6d2bc2a51f96530cfe/rabumobelizonowovonaroni.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/615804d3c382e4ef02b5ac7b463708fa/dejemepawodugezu.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/46c75ff0c540b4cc521773b45d167882/69491294479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+hunger+games+mockingjay+part+2+123moviesPDF 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_off0000f442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF442 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C59 11584 bytes
SHA-256: 5020ebbbf361967c081bdcd9bd8850c9e7287b0218bdd539e175addd1e1a09fe
font_02_sfnt_off000127d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D3 17952 bytes
SHA-256: ba3a99926e5fb68c302740aa139ccffcc63975f3d28cec35d0b4c93f31809748

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