Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a73ad51ccc9ef7…

MALICIOUS

PDF

78.5 KB Created: 2021-09-06 14:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b77f68f806d889ee9951d6bf9fd06d49 SHA-1: 2da8ca227efdc2ab5630cf2c936c589c6548681c SHA-256: a1a73ad51ccc9ef7daf6f309fa7c4cc7ba06e2938627b19e00700153ab735a3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains. This pattern is commonly used to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/2bfc741bfa0ba5cf4a9a50ab1ba21e56/75850440353.pdf In PDF document text
    • https://burstallconrad.com/editor_files/file/basubebegu.pdfIn PDF document text
    • http://schokobrunnen.com/idata/80188987151.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/46088072442.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/80b39b809b611b91588c8a53c198a7f2/13178179884.pdfIn PDF document text
    • http://retailcop.ca/files/99652079250.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0eb8e83fc---jarozubaw.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dc50be810---11628865724.pdfIn PDF document text
    • https://ocw.tw/uploads/files/mekufotidusumida.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/6988032042.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/xuwukufisa.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021081607540393.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/09u4bo0tb9lpqgpme0g6jj5ttj/refovajexokuvaregixem.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/44445045390.pdfIn PDF document text
    • https://songhongresort.com/img/files/rujibuxarasowusujutole.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608706072f974---degatejaribatupavokoris.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/e441a8c9d8dca1eae2017a44dce9ebe2/21554661433.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/65799342120.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gejavufavotusi.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/xorevevavil.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/gedozenanefovug.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/5vo7h9t03q011tu075pcocnv93/mexusikopofur.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/wamowizonuxuxuwulugekifuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=bodyboss+ultimate+body+pdf+downloadPDF 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_off0000c990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC990 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A7 11052 bytes
SHA-256: defe39ded7d30cd611f151898583555fcc61bf59b2bda6bf4b35ccbcf2d91f0f
font_02_sfnt_off0000fb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3E 18812 bytes
SHA-256: 75c0f94a90981e2c5b9db44eacc28bbaf9791558a2fd29aa5d23d9bd1defe104

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