Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04b43ed1ca4e72a…

MALICIOUS

PDF

88.4 KB Created: 2021-07-20 06:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3b5c778c382c3507562c1213150d789a SHA-1: e3cd030c81bac3c3d6a40be4c99374294bb0c7bd SHA-256: c04b43ed1ca4e72a5030e47dbfc60cff7402473cef188dd6d3cd511a5dbe5cdb
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress sites. The embedded URLs are designed to lead users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://robwalker.net/fckupload/file/xevis.pdf In PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160872b5d4eb34---80268262784.pdfIn PDF document text
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef5a4b5e5d---gipozedabeloga.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/zilufuj.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/61730344769.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/b2c590bf747569b2733667ca9e8ee8fa/mopazawezisibi.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28b2e8729f---gojepuwivosakezixipaj.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/48459019760.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/82aa4d586ad7b206a09d00df2a908b28/92455475899.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f3e156e0f7bb1f7ebefb35e877ca2785/runivevuxelelaxawitevew.pdfIn PDF document text
    • https://emmaushuis.org/pages/xivunumedewiz.pdfIn PDF document text
    • https://doganagolosa.it/file/46739336786.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/09164d4f08376619ed79db157aac7560/38176039182.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1028bdbcd5---76309149295.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/xaperejubab.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a85ce00a64c---29236394961.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/dibevapuzer.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/30837745310.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/ff1673aeb3c5b350774f0243e5a49f25/14243251946.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/6a06a755984385a5ea4d11c3f52b7e8c/16951922684.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/4ad5ed8fd5f4f0e4a479f07eff3b4014/xunalalane.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077811b2fd07---fozaziwajaro.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///kudigugogazomifenolutudi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=people+use+you+quotesPDF link annotation
    • 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_off0000f9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CE 10148 bytes
SHA-256: e6d906020d437013b456cf7353a33ab6727db9ae95f91bf399dd3265e7ca7be1
font_01_sfnt_off000110b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B9 16776 bytes
SHA-256: b984572de937d236801c4047b6287bca811827af582d6cd579a0b969d006e9d6
font_02_sfnt_off00013c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1