Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa1afe33150d5ee…

MALICIOUS

PDF

75.6 KB Created: 2021-08-19 18:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dd0dcd5011ada50d7abb73e1abcd8538 SHA-1: a169db3671824e30b80d2292630d344a8a462750 SHA-256: ffa1afe33150d5ee9c2a076993820a67e7fdcf2a86a06d610677ca9f55e454b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics strongly suggest it is used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://archism.ru/uplcv?utm_term=compromisso+radicular+bilateral+l5-s1 PDF link annotation
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608030f1c64eb---kewipifanopavubu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/g4k8h9452bpms3ilgbsjubmm11/40016962343.pdfIn PDF document text
    • http://abc-tel.ru/data/File/35761903890.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/99689972849.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/85131851348.pdfIn PDF document text
    • https://kueapem.com/contents//files/zozunudafagof.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/e7cdbc35d44ec27f27437f07fdd582c3/jodowinijaxibi.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/fapase.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/rlsc2fnuoa8tqgcpduphttu7nq/narakugabosekis.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/d55403bd650133a51721073dd1e03205/69166132211.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/54219821134.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/xedusunevetizisiru.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/33591961907.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/62385825963.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/wefutufemasudisele.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7a50c33e0---48518656148.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/gemulakinanufidigigova.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/siduzirawulaw.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5e535f095c8f3eaf454b3d86e56763e8/riripalawalewaxidudufetob.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/parebugizogovezenudumofu.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/76100485349.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/c8d27dbd5fa3a87cb7e966a157b9807c/guzilumekejax.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/78670211888.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_off0000c590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC590 15760 bytes
SHA-256: 7a8315184869d86b132d9f0bbe73b1630f8b5042cd401245afe9f80164087dc8
font_01_sfnt_off0000edf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001060f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060F 11064 bytes
SHA-256: f8a23da2b7776105fa8940156dc09b6f40102377d0de6568aa4f5cdea8847126

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