Malicious PDF — malware analysis report

Static analysis result for SHA-256 3377026fd0be1c5b…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 09:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: da37258359b793e61d1a33b6d9a4b833 SHA-1: 8486f6e2278edbc60b1d539ee904c318cd2acad3 SHA-256: 3377026fd0be1c5b09d60780575e1ba7c0b4306c958e4c427be331857aa97e69
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or unknown websites, including one hosted on a compromised WordPress upload storage. The presence of numerous external URIs and link farm characteristics strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://konemara.hu/userfiles/file/vudulefekujajijomi.pdf In PDF document text
    • http://underbutter.cz/download/foto/94610017548.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/75161724514.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16144a5a88653e---jusavupuguwawejirategawa.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/59585500612.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161300ab49f98e---wabuvusunuzozoruxix.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/kazuga.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/zuluretivanir.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/nukebizuxarikozo.pdfIn PDF document text
    • https://777mto.com/contents/files/jujimezirezexuk.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/nitufevasezitozowi.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161430b7d7bc80---ninixenadixoxijizotiji.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/lepuzorosowivubagib.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/zafakavobanelusona.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/12463116453.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/pexepolovugazebi.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/37371941492.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/bipebokumunabo.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/48517784178.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/kalexajejavexumasetenozej.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/tuponitiziniperowox.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/73753738448.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/nuwudegolukovivuf.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/55630048568.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/757b9121749c90dd5907278b50ba360d/luwunisaluduza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=legendary+heroes+moba+offline+modPDF 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_off0000de8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A4 10916 bytes
SHA-256: eadd7cebbc3a009226bf12cba62229966b199cc4e87b253ae91655fb3c9dbf9d
font_02_sfnt_off00010f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F70 17336 bytes
SHA-256: 87a4d7e1dd8a01015197cff1198bf21ee6336f9946447f21f309ee94400e14e9

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