Malicious PDF — malware analysis report

Static analysis result for SHA-256 972141cc72a85348…

MALICIOUS

PDF

84.8 KB Created: 2021-09-01 12:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9661dc4f62a1909f865c9d31554eca4f SHA-1: ec2440590e9bb6bf1746a286fc20100538b0e4bc SHA-256: 972141cc72a853480ca89d15a52eb6482af332354c8bf15a9422993b935a3d2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains a link farm with numerous URLs, many hosted on compromised CMS upload directories or disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://lucann.com/Upload/file/bepirupirifolujefol.pdf In PDF document text
    • http://paillasse.hu/userfiles/file/58590107447.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/medefivozetokelim.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/bezomaririmazudosusa.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160789d7dd54a6---tedubutosuronogax.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/gugovemibakufodagasolu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160798c4ca472b---71117642990.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/452nof4d5jk9kfbdh53i77rgn5/61547169570.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210524004007.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/fopuzafojopibe.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/43208452041.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/a7be8ae7c5859264c23a45b3ebabf61d/24767462112.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/76827986704.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/pinifekitovizatavabobel.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/jozukufotuvonejo.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924eed5e212---wizesesizuz.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/29870505921.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/49298820185.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/52261363106.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afd86bd12d7---81344170630.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/34613996898.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/9084ff08493625c56b0cc3f7479bfcf0/kumopezajiwagesojemonejam.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083bf094c697---kajorejapitelufofe.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/padevinopotefubezibumu.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/xegebaroloronebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=bronchial+breathing+causesPDF 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_off0000e8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B6 17132 bytes
SHA-256: 9853bea5dabbf3f1518f77329a9651bf0216020b0b65e13cf430448baae4a220
font_01_sfnt_off000114e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E7 10800 bytes
SHA-256: 719549203b0481d80330cb0c4f761d9da4a0604ee253a82fa8e0be2a5ed7a29e
font_02_sfnt_off00012dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1