Malicious PDF — malware analysis report

Static analysis result for SHA-256 b17f6aca685c62e0…

MALICIOUS

PDF

86.2 KB Created: 2021-09-14 12:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0406bafe368c07fda2ff36ad24d1bb94 SHA-1: 1662d37f48fcf4d6ecc62ef57709e1fabc1ccce0 SHA-256: b17f6aca685c62e07e40716cac50a63cfe15fabbf918a6ccca574a1b6f0f49f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to other PDFs, many hosted on compromised CMS platforms, suggesting a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure disguised as an Android system update.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://marcelponjee.nl/ponjeefiles/file/86999903437.pdf In PDF document text
    • http://onnetsolution.in/userfiles/file/37849421420.pdfIn PDF document text
    • http://fxmeat.com/upload/file/b0c4bc7b491554d35caac5640ee9b142.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/pupiwejuwanejuved.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/karofekokelalumutixorodat.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/gobinazisurafig.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/fuwugimivagogeg.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/lizafibizegofeb.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/7335161312.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee894e1174---lenikejerekoti.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/vezozoguxujok.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/46805921942.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613566f027c0d---simawogenitares.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fde33e4eec---60119262372.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/36454006543.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/jojijujozowuba.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/vexofex.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/tobegakoxitari.pdfIn PDF document text
    • http://yibetter.com/data/files/65654104603.pdfIn PDF document text
    • https://tierlistei.ch/downloads/95181173092.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/mebametobesufolo.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/kawituxut.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210912044835.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/59078108276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=android+system+update+12PDF 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_off0000e84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10065 10876 bytes
SHA-256: 3a199c6440b232aa263a9ccc90e0e9f75454b9093e1069bac963485349cc4bae
font_02_sfnt_off000119ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AB 19160 bytes
SHA-256: fe7cba719d8e87f63869610d740bda9a121c6e5d8668506c99c62d7cd6c7c3e3

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