Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bdcd5d634ac40e1…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 02:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 09697af6948bba7bcfc6664f9a51491a SHA-1: ebb5924040a9e6aa2f0bc88234e135416e51d9bf SHA-256: 2bdcd5d634ac40e1dda25dac05ce90b5b2387f1ffb5fe3290141ce01ddee01d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics indicate the PDF acts as a link farm, redirecting users to various external URLs, many hosted on compromised or disposable domains. The presence of embedded URLs and the PDF's structure suggest it is intended to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://philabc.ru/uplcv?utm_term=horasan+erenleri+pdf PDF link annotation
    • http://business-baltic.com/myfiles/dok/nitujiraka.pdfIn PDF document text
    • http://fullx.net/files/74020191942.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/memapoketukowenamudozu.pdfIn PDF document text
    • http://usagimatur.com/files/others/16031175126.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/jumolilodamin.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/tirafemetazegu.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/46473957266.pdfIn PDF document text
    • http://jfe.hk/userfiles/95547216798.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/44920328736.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/1akgdojn0lluv5upk7lra4mh17/daxijiwixuje.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3d78c7822---karafimibozolaruwenipise.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f714af5aedf---89484978301.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/66373540812.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/4u1mub9b2tpvhj43ku12anfabd/78623293823.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3e77486bf---vufolig.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/duzedudifuzukuvikebog.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/17012415283.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/91938084531.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ed48aed41---fasozubepifa.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ixibuwu.pdfIn PDF document text
    • http://atomleasing.ru/media/File/78302564021.pdfIn PDF document text
    • https://ms01bet.net/contents/files/tineda.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eda3396c34---viguporufosetilim.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/e83f17512d40c248c1d6c2446b78a609/89461075926.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_off0000d453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD453 10384 bytes
SHA-256: 9a04c5f60f33edcbafaaa80c9d7c624911e4045f65420a6eadd5b12f51319d24
font_01_sfnt_off0000ebcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCC 19172 bytes
SHA-256: 0131b1db876300f7b90dfa7ed90da5cd8652a248e8dc08f910676a14fa30eefb
font_02_sfnt_off00011a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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