Malicious PDF — malware analysis report

Static analysis result for SHA-256 a998274a49d51b09…

MALICIOUS

PDF

76.6 KB Created: 2021-09-06 16:35:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 100f6288cf022db5373ce1a9ad733af3 SHA-1: b035d018968c5ff377ede6549273f24dca94c6d4 SHA-256: a998274a49d51b09c8233b3b44dca6704961b934c585e9a588ef6fa15e477da1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=balanza+de+pagos+china+pdf PDF link annotation
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160779555be982---87553089069.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/xuwanolimibirubujeg.pdfIn PDF document text
    • http://www.520amis.com/upload/files/47665377751.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/gozatatujetajurino.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/72bb14951be429b9d85395633c867d3d/12376213570.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/e32d10e720f929a0d4688fe93180ebd9/jevopi.pdfIn PDF document text
    • http://rem-proekt.com/f/file/delegom.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/25779218672.pdfIn PDF document text
    • http://simonide.org/userfiles/file/17348858207.pdfIn PDF document text
    • http://novichiha.ru/pic/file/45252039819.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/5c90162d0f76e19674c5fda9e4588413/jixidagapexefatesufovovo.pdfIn PDF document text
    • http://navigator-33.ru/media/file/68472824133.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/45be1cfe1fd2890cb177158a64edc479/25917298929.pdfIn PDF document text
    • http://industrialdevices.in/uploads/85285984451.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/45449328763.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/853cql3ss64679sntiate9d132/xirodixujaduzipoget.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/02f8b80fcee94a6905527884724a9e48/18765833056.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61357885985.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1be5d14ea1---19199910083.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16126a2fa9673e---44384286920.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/e52b162b448941a032bac372fcf1d4b1/41918131838.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/5d6a74194286666f17c5d96051bf3463/2050742710.pdfIn PDF document text
    • 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_off0000c343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB55 18440 bytes
SHA-256: 1cfdb2c60e28467773edb96b77fab009dc476a12a84b4d4c8e3822d884875365
font_02_sfnt_off00010ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB7 10812 bytes
SHA-256: a2563cb6536fb6b29e80dba0d90d0a870f75df9e8ab96f50ed0132363964c4ff

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