Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28cc250aa45ad02…

MALICIOUS

PDF

82.8 KB Created: 2021-09-23 07:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 80b72d8bfd347c81e0beceef70b3789d SHA-1: 92e90b1036f1b52cecc8522febc0911c98bf875a SHA-256: f28cc250aa45ad02b504de4255b71684b5184ea04d2922e009ac7fa0c08a59ad
164 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://elai.kz/upload/2021/09files/210917055627404059kygk8.pdf In PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/h3vk7oaoi4k0hhfecv678cgv6e/figanad.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/kalisitigunimufujo.pdfIn PDF document text
    • http://velo.hu/UserFiles/file/jodutuzebijirudeweso.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/bc8ea40cca64e700b261363c6532d9b9/40634784134.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/jiwajinixipolugafodewe.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/83009652737.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/kebok.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/47337067876.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141379d7e3d6---vuxafakegozivopowepebapi.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/samegepuzasuzemu.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/10022404960.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/37165564883.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/pajutidep.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/70422627995.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/69707406880.pdfIn PDF document text
    • http://baoveantam.org/upload/files/92953206111.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614553e211b88---joderedetoputudog.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/komamenidulavefozuzor.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/4480835880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=parallax+3d+live+wallpaperPDF 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_off0000dca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA7 10324 bytes
SHA-256: 1b1842ac26ce2d9d549f9c7183f8e15ce96ac8c342e31749dd5371695188e2c4
font_01_sfnt_off0000f408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF408 18920 bytes
SHA-256: 259b451b11d5e0b0c854a3950bc3cce9d5b0a3f60e1f71709d764a5425693040
font_02_sfnt_off00012594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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