Malicious PDF — malware analysis report

Static analysis result for SHA-256 516275ad6a4f1d14…

MALICIOUS

PDF

72.4 KB Created: 2021-07-03 23:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9387ac732d3a3e8ce3ca07651806b08c SHA-1: 93cfbe5866ee41ffa4c0789688366a2640a82c3d SHA-256: 516275ad6a4f1d14671ec91ef134a7438df706a14975e11b7240e49521ba4477
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. The presence of multiple external URIs and link farm indicators strongly supports a phishing or malware delivery attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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=abnormal+q+wave+in+lead+3 PDF link annotation
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160823680aace7---51243253945.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6c88df442---55577665786.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/5ade5604a2b3180f58d1639db5b55089/8863748687.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/fccca1e144a6201156359472b6f892f6/jokozomiribodu.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d643f0574---damufularukizulefifa.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/33551052761.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/f0733593d0f94aa4ac96d1bb11043f84/xavununerotinatufoda.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/ropejasalazomujunuji.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/sezajabopumobetubetal.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/47241638531.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/68000135417.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/jafuliwetipujeg.pdfIn PDF document text
    • http://abnicum.com/files/file/98822101121.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/guwejisiderinoxezede.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6be3e9472---57268057389.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/su13i2l68ro5oc6hs2dq0vh694/puvasofo.pdfIn PDF document text
    • http://samtekelektrik.com/files/80739251193.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/kalekebejo.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1c95e037b---zebabex.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/74846778607.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c585c70e5b---15992755009.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/78016006344.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_off0000b957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB957 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16E 10732 bytes
SHA-256: 5e102e08f7a8b90ebd4ad53a698279ba457e8772d2f1ca342e40eb3dda8b2b83
font_02_sfnt_off0000e9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E1 16800 bytes
SHA-256: 23337c05c8633f8a0732ad0e8061cf5716022454312dbf19c97b81774b53d759

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