Malicious PDF — malware analysis report

Static analysis result for SHA-256 51206673b5a68a2b…

MALICIOUS

PDF

84.5 KB Created: 2021-06-11 20:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 97222cfb4642959949de2ecb23612409 SHA-1: b3c5993b64e421f2222f273beb02a4d89be65a97 SHA-256: 51206673b5a68a2b71620cf4f2a9879a5e309b06cc124d3ba59c4f3868ca96cb
164 Risk Score

Malware Insights

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

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 presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=evo+wars+mod+apk PDF link annotation
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/3f23520c2c254d6f5d863e378b3d1abd/71134627882.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5281ec270---71881219195.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/dovamapapelabiwu.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160962bd08e092---9544072802.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/ketipepejolitibe.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/3bc2c8e7dd76d26ec3caa1cc06385f38/18478867168.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/47232498877.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/d9e203144304d884d6f00b97211bb3f7/vikeg.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/siuhcbpefvnno576k34conk5oi/sinetetizumeseberexepagon.pdfIn PDF document text
    • http://asustainable.com/global/file/87466704105.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1fea9690c---95982876248.pdfIn PDF document text
    • http://garderoba.sk/images/_file/25784223961.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/501a3d0a4e5a80836b7523c2ea1474b5/rojaxejudapakos.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f2ba42b60---sunukufaxafopin.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/35731222104.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/69225935420.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/67f7f98a9f250987d03338e1ce973dd1/tipisenosubijiveruk.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/77829310516.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001257b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1257B 19164 bytes
SHA-256: 8d7a047ebbcaca023fb26d08713feeed60f6e360999780047e9eaaf3fbe721d7
font_00_sfnt_off0000e23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23F 2828 bytes
SHA-256: e107a41c86adb7bd4c3b16d4b038ee5acae0fd4ef0a78cb1ec05ff987e5df2fe
font_01_sfnt_off0000ec55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 5244 bytes
SHA-256: ee7a9336d8ec9c72eb33bcf03e3b364aff83808dd99f4c0fa8cdbcfe14cf4951
font_02_sfnt_off0000fe2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2A 12288 bytes
SHA-256: f180af83781eb43988981697653232a225fd8a95accb15a59fee9c03d1f618b8

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