Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf742edc19b2c198…

MALICIOUS

PDF

78.0 KB Created: 2021-09-04 11:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6ddb61542cdb924757082d701b29b0ec SHA-1: 78464d1b9b8415cd986c09f981f2289e1c75dec2 SHA-256: bf742edc19b2c1980b4c60cd9e7c7360d56c3f18c8cbf4f2bf9e75f943fa2a2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://synerhu.ru/uplcv?utm_term=artificial+intelligence+book+for+mca+pdf PDF link annotation
    • http://bukvoznaika.ru/ckfinder/userfiles/files/79914009759.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/llp14boiv3gj1khtc8vv0fjs9t/7021064692.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611341bf76685---zisakidozefebirim.pdfIn PDF document text
    • http://rts-3.ru/upload/files/12895862260.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/da200c50c93b0345f4b5dad3c312d580/feromejoxuluwefisuj.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/85852972074.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4519dd4b946d6133bcb562443668fe20/31273198834.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f375b86e5d---52252740347.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/laguvufadumonitore.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/85552493451.pdfIn PDF document text
    • https://teamcode.net/upload/files/29275234196.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160881783b257c---21346690165.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/18060216639.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/7f94d571f268df80e8fe6e4328ea41c0.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace6ee6f333---buwiruweruwo.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/pomefutopidakebogojoxu.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160880432efc50---ruligekomo.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/28595026048.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/83949081984.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/zazekitugesavom.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/bifeniperefazip.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c85565bcc---74050318884.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b1751f468---guwag.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ogpv4sd5eqcu4cg0rb4g2r1rl8/88084784859.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/15639220100.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160736747ee3d6---62931255524.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_off0000ca96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA96 11008 bytes
SHA-256: fa8d7e3e069c02be83f1bc75308944918bd3129a11dc42302984363f46ca0dd9
font_01_sfnt_off0000e3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BD 17736 bytes
SHA-256: 498a6e448bf78bdd17d243798aca60da8213c84897bc6272fae3ee5c9d1c4ef0
font_02_sfnt_off00011211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11211 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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