Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a7ba19a900d66b9…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 17:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1cd28251819b4084ae60d8c1a696bf83 SHA-1: 8fc402ac1f9b38d7c0d765cd1a4294e244802cc8 SHA-256: 8a7ba19a900d66b9d32c9c90bdf0b5f6c6bbfc77da6db471c4dbf2ae79c36e1a
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised or disposable hosting. The ML classifier and ClamAV also identified it as malicious. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://arvikabc.com/images/uploadedimages/file/desogobawaf.pdf In PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/9vvlmrjieobt34prk9phr9ph85/ropirikuzokowepomabakibal.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/73464239383.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/9b0691c89a96c677ec80e2bb9792e147/32489129683.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607587e3ebabe---disevaka.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/besonitidexodi.pdfIn PDF document text
    • https://lesura.net/userfiles/file/gufowirumasawatikefilazo.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/zizetawaguwogisozilar.pdfIn PDF document text
    • https://davaocarrental.com/images/file/fujuxatov.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf6b38d1ee0---zodirizeduxas.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607276533e6e8.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c2b9045d75---limuxoregazagifozufalof.pdfIn PDF document text
    • https://cubic.is/userfiles/file/73516454345.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/sonobomim.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/miwodu.pdfIn PDF document text
    • http://ud2-140.com/files/18708410007.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/dutajanujuvizibu.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/pulefi.pdfIn PDF document text
    • http://www.bash.cl/media/file/82645256035.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/1083521313.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/1436ebf316461bb3a82f8d323fb0c28c/79753271002.pdfIn PDF document text
    • http://cissi.it/userfiles/files/43084764465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=cubic+cm+to+litersPDF 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_off0000d54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54B 10396 bytes
SHA-256: aa61cadf5db5379134eb13c53504144da8ec2a9c9d26b5615fed09cff1004fb1
font_01_sfnt_off0000ecdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDC 20216 bytes
SHA-256: 81f99a917d6a8c28d7b6b0613a3c41672b5204e0d1988a39d5323be4b48e1a74
font_02_sfnt_off00012217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1