Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a71a44cd643f9dc…

MALICIOUS

PDF

82.5 KB Created: 2021-08-14 17:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9acafaaf3b889a8e549173b7a2610403 SHA-1: 5c89a8620d083608c9627152602aa07dd0b7456d SHA-256: 0a71a44cd643f9dcc4e8657f64763a97d75c35f8da07f43d1b70448a330b2583
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external URIs and link farms pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and numerous links are indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://smidgel.ru/uplcv?utm_term=ben+10+up+to+speed+mod+apk+happymod PDF link annotation
    • https://itexpertdog.com/upload/files/34783217325.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/87113416841.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/54977920441.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16086a0c9ca548---64919253622.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/nge6g0e786s149olbcm958jk61/59050387818.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093f733d4156---vizegefipefofigasajitiwe.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607e83f672086---57055598951.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/98826139120.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f96192ec25bd66600ff71cd5ae9c798f/63072005132.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/98477186561.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/83778072903.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/wusagekeso.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/nikilimekuso.pdfIn PDF document text
    • https://carlojans.com/cms/file/nafigigorasaxogolowe.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3bf3fad910---45148285651.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/fawalewefudurozakiribax.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/460abd0b4aab6f6c1da267e33b28c035/96086655241.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/63460343903.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/foxagizofofobiw.pdfIn PDF document text
    • http://akademibt.com/resimler/files/tezevinak.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/zilikijoluweva.pdfIn PDF document text
    • http://esistore.be/userfiles/file/66508463598.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2950d2eea4---fokotiwowimaweporaxidu.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/e792c16e33d624db668f8361b6623551/35518836665.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_off0000dd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7D 10952 bytes
SHA-256: b46a2f95dfd5a6cf6eab4b18965f05608355e692efbe4be096152a6a27d8e9b1
font_01_sfnt_off0000f6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CF 17384 bytes
SHA-256: 3fda8a5e1276e150404eb95225837590ddc93c7374e06e6d2e301461a301cf82
font_02_sfnt_off00012377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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