Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f954a6876f10af…

MALICIOUS

PDF

88.1 KB Created: 2021-07-24 15:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f824ff4e72a5b0675b0dc60ba5d0c1c9 SHA-1: dc78a730395cf2292b3a9c66c7bcf7ec5218eafc SHA-256: b1f954a6876f10af50b73c6d5467a78800327d437cb4e43f2a4490f127ad4567
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c26c99e561a---tiwefidajibomasikagufol.pdf In PDF document text
    • https://liantoong.com/archive/upload/files/genonaxarupofufuvuwalik.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/poligidoza.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084b71a2e649---labisamovekutov.pdfIn PDF document text
    • https://nevisnews.com/userfiles/xinidivexutapukupop.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c695ef277c---71630491475.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7970d2502c---mugebovomipaguralukijozo.pdfIn PDF document text
    • http://edgecs.net/documents/pelixano.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/baxibexunawipitovewiji.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/48635965359.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/pawoturewurupapasomuni.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/82664439698.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d142e8f69---dogegirixusobilo.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080464892d85---lukad.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/13184913353.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/bafalipopuzofoli.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/subuzanaxizunodo.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/wavado.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/10198987181.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/jamafafilemuxebebe.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc6c191891---95872032965.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/23685306616.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/7d9hvtomksi7lo85rf69cirtae/wufujufomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=frases+de+gratitud+a+dios+cortasPDF 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_off0000f4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F6 17760 bytes
SHA-256: a8a8c2d447541e01755784a71e4fd7aa66f5aa1bd67c681dcf4c9164269bf66a
font_01_sfnt_off00012182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12182 10472 bytes
SHA-256: c5150d6f94abbca064f9fe2318b07f58e4d18c2fb117de36d05e53a4899d2e53
font_02_sfnt_off0001393b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1