Malicious PDF — malware analysis report

Static analysis result for SHA-256 4775de8ec00957dd…

MALICIOUS

PDF

138.9 KB Created: 2021-06-10 00:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: dd0114fc3b2e7dfd373170fe44798607 SHA-1: 6b9b456dc1f6181e932cc63567a1def6b4a9c1c6 SHA-256: 4775de8ec00957ddffbcac32b432c2ed7ad2bef911c7ddca7214818b2eaa62c0
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 0.9990

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.
  • 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://krisoc.ru/uplcv?utm_term=hello+beyonce+audio PDF link annotation
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed8e6a3089---vuzolen.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/3530609214ccb8fccce20f52e7222d45/48015486632.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ead15da15---63232411646.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/55887984514.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/93481915376.pdfIn PDF document text
    • https://tavio.ru/files/file/jozusasozomogexepad.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/cdb87cee6310ea48ffdf1b11add520c9/96505934385.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f53f0106b---20704632587.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/59ujfo5pfgd2hor40kcdrdaah7/6782403278.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/69711348334.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094151716f95---21245629532.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/16997340694.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b73c3216c---zarilaro.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb75506bb09---90288559117.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/eaaefced6c55052e9416e208eb3e87f8/xikovurasuxeko.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/hh9smguej5h7aimp19e5ajnrl5/73684549034.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C0D0 3212 bytes
SHA-256: 714c62ddbecd78c017321634c6970784ec8aa36743087aa9d01d28c140cf6207
font_01_sfnt_off0001cc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC5C 4864 bytes
SHA-256: 52da53366af94bcad48dff796661b827f179cb42dd1cf3ecf65f856acf66e2be
font_02_sfnt_off0001dcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DCF6 5680 bytes
SHA-256: 183d9b278f8445026edd0afe8ce74040df4365449c35b05b2254ec95d2c088a0
font_03_sfnt_off0001f0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F0C6 15024 bytes
SHA-256: 0f1901c8db357ac26d8233725a65f9954f55f6d575391b60fdeb6baced2e2543

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