Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8627fbd5c253d2…

MALICIOUS

PDF

76.1 KB Created: 2021-09-17 21:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 89fdc721b7585e7a87f654f6c3282dba SHA-1: b22948217d45d4bab571c6c48f438341568da5ef SHA-256: bf8627fbd5c253d251615c747249725333f0ec074a783245942723159dc618db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=design+of+machine+elements+ebook PDF link annotation
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16136c6a1471ab---81634767874.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/najiwevividotimok.pdfIn PDF document text
    • https://tenhucchi.com/upload/files/20800712605.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/31463649599.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/17339164332.pdfIn PDF document text
    • http://soles2walk.com/data/file/75271366613.pdfIn PDF document text
    • https://fratellifurloni.it/file/89954337388.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109062347593046.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/visinifolovabukebom.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a43f05cda---panowili.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/5117234682.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/sexebokopivatepona.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-17/20210917084659155697.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/luwapularavekawet.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/rt3t9qa6l7doglrnm0mqbhl9r3/fizibozaxutumunegajozemu.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/jofegupakarebipuvuvog.pdfIn PDF document text
    • https://hsse.cl/files/nuxisupokimepiwivij.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/jorodituvewi.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/fenifasemeso.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/roputovepemasog.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/96b59cb48dd003c9d1debbb93c2cc4ab/kixaxidukavibas.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/96544590208.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/bilawipag.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/vobakaziwev.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/82925251141.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_off0000c6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C3 10916 bytes
SHA-256: ef000348907a0f1c74f39110a5f3c4de96954f258fc70d136ab906a99565cfe0
font_01_sfnt_off0000dfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FA 16544 bytes
SHA-256: f2fbc37cf87350e52646b2360b9d74b80592b22c36bb88f775b7358e36211a20

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