Malicious PDF — malware analysis report

Static analysis result for SHA-256 67de05b743778101…

MALICIOUS

PDF

85.7 KB Created: 2021-10-13 11:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5deaf5c35d28e72fad5234b1161a6b79 SHA-1: 94355a27375c37e52aec53a7ad51769fa64d70d0 SHA-256: 67de05b7437781017e67fe16853f9ebaef28ceef3050401b994b4e02f3039ac7
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF files hosted on these compromised sites further supports the conclusion that this document is part of a distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://catamma.ru/uplcv?utm_term=reflection+practice+worksheet+answers PDF link annotation
    • http://kargo-box.com/uploads/files/42834640616.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/d473c5ed190df5c95b26cfbb26520405/pogofes.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/58662235670.pdfIn PDF document text
    • http://uteambio.com/upload/files/tasaweluxum.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/guwedevipepifuj.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/53449755615.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613991308bb4f---medadavivew.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/patusago.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/90144837748.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/38472513281.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/gaburejosorigawebame.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/83850731455.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/70320911420.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/guduwonoxenutakeboma.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/46240341972.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/rudedatufune.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/12412033994.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16158b9e4dc9f6---lolomet.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/wixog.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dipulemavutim.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/bazilonera.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/61115581163.pdfIn PDF document text
    • http://standardamulet.com/files/files/64382353708.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/sexilelisope.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150b65de125a---86136356884.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/rolubiroduguwowivorojirod.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_off0000e42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42D 10800 bytes
SHA-256: 5fcce6ec1af2083d1bf16f8e5cb30903d2a6afc143d21ad1d1b134f1d6e67677
font_01_sfnt_off0000fd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001152b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152B 19960 bytes
SHA-256: 0644363cc5e7f7f50a418994e9276ab1508cb059d6fc4154744c6c23ff123b2d

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