Malicious PDF — malware analysis report

Static analysis result for SHA-256 483dd4f5635c120a…

MALICIOUS

PDF

84.2 KB Created: 2021-09-08 11:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 787fa2ca2dda8498a37edd0d10f9bd1d SHA-1: 7a1431fc6f798829f62a293e078a84a01f19449f SHA-256: 483dd4f5635c120a0edf908241f702f82be3496ade347aaba42ce1a90b2d35ec
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites, some hosted on disposable domains. This suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ketchas.ru/uplcv?utm_term=metanol+zehirlenmesi+pdf PDF link annotation
    • http://manisafar.com/basefile/marcosafarir/files/fejebutazev.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/2510255695.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/51863796672.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/wamaroxa.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/busamaritepixiri.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/jewovaxajulebabimemap.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bb24e380a---jugidofutizu.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/50842351143.pdfIn PDF document text
    • http://chinahongji.com/d/files/12136851620.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/67974695329.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/tudizeletavib.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/65457648304.pdfIn PDF document text
    • https://nevisnews.com/userfiles/30518497507.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/67886450976.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/garrhof6kfgk0gbg2hqkbkt09n/wevedawesamufujesuxox.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d44dd8addd---vuzali.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c2d4dc656---41182832003.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa131b5ea7b---nodafidozamimevojan.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076c077019ef---55483502837.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/qr71er2tibp709j5c9umgokhbc/xowasuwiwunu.pdfIn PDF document text
    • https://info-jimukyoku.jp/lot/upload/files/92580655875.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
stream_003_off0000c89c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC89C 18536 bytes
SHA-256: 1427dcf37ea9ce17d925903d6866fbf72e3daafd565f3933e6b0548183205245
font_01_sfnt_off0000e5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C1 17932 bytes
SHA-256: aac444c0fd98bc9d80baf32e82955666086ac006590c5097c617013e3fbea8bb
font_02_sfnt_off0001120d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120D 10816 bytes
SHA-256: 3bc0b21ed434899d9b73f5b2eabd9630bb8d00ec3f56d06c5639fadff7fd24ef
font_03_sfnt_off00012ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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