Malicious PDF — malware analysis report

Static analysis result for SHA-256 468c1d686b1af705…

MALICIOUS

PDF

96.8 KB Created: 2021-07-29 21:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1bc5e1bcfa8af8709d7b55c9b81767a8 SHA-1: 6558e65287794e530654820708d2c721e2cc6ace SHA-256: 468c1d686b1af70540698afaa2be6a3307e9862f36f2342433caaffc8f7b2f71
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs pointing to various domains, many of which appear to be disposable or compromised, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure itself is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://nomylo.ru/uplcv?utm_term=alfabeto+japones+espa%C3%A3+ol+pdf PDF link annotation
    • http://flyingcarpetclementines.com/userfiles/files/sesuliroge.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/eaad77f007ac5593d66915b8a4d79d95/divupedimukerufogegog.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/tivebujanosisoserokajafa.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/311750559504.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/nozokazemeg.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082d08f81345---64958505472.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210625_47045375EBB147CF.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/muxusixekamun.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/20058685135.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba425dd16ec---49673858626.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/kiridifekurim.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea88a3e16c---wusukifasiserovukepu.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/765e67403130bf1725c1cd26257f4d67/30640011172.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/29936344062.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16079a54751492---razatobadokinu.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/a432618e896f958c60afddc098b0dfd3/3291102492.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/lipaxanodeg.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/27131990383.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106181846.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/5954337972.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/6c15c3e5e20a267e494d5d4b0b188870/19215657632.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160f79ed92b79b---gemewuxofizamonijikuzufaf.pdfIn PDF document text
    • http://haus-st-otmar.ch/userfiles/files/73184582781.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E3 10816 bytes
SHA-256: e002aad01d8162818c552e166d24f2057d917f3efed465053ba4d2164d956f52
font_02_sfnt_off00012252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12252 9888 bytes
SHA-256: 880deb4bf45ef1256dc303408cf0281040291ecb404d8f5fbff1bf963a7ebac8
font_03_sfnt_off0001430b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1430B 19464 bytes
SHA-256: 53e1f0760d1600adec7e0ae717b523765fe8a10b19fbfdc9bf1612610b1e2373

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