Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4dc026dd2f80e3…

MALICIOUS

PDF

84.3 KB Created: 2021-09-18 04:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d5e98d31cc99821aad836d5b2df57f73 SHA-1: df785cf81219cd850f33089762b9e5765f8fd647 SHA-256: aa4dc026dd2f80e382f3bf97acc65588ddc82e2e9308d7d27b4f7b6809190b93
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of a link farm with UTM parameters further supports the phishing lure hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=what+are+the+two+colors+that+make+purple PDF link annotation
    • http://denis-lefebvre-services.com/fichiers/file/25828744352.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/zojadifu.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/dp636jbgbvnmnvrldcapafttke/58593510484.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/savorerixixu.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/64489222802.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/fugawunarozime.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/84f4809c48b6ce1e47e17acfd5977fbd/raderidu.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/wawuzujepolof.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/senojoseno.pdfIn PDF document text
    • https://tekartltd.com/upload/files/kuzuwutuju.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/18157751410.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210906183304.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/428620794.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/20323051484.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/lesuvadoposebo.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/pufutamog.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/batezoxazimotomiruzukawid.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/56700618001.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/61648771001.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d1d2974f6---sajirazovemofibukogokiv.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/bemokarutajukeris.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/lusap.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/10035235447.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a826a86b88---mosak.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea42b701a3---zorosakeb.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_off0000e85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85F 10712 bytes
SHA-256: 09acff415939a58d3d709aa00667454d4554cbffa031c7b7fdd9679beb6a09c4
font_01_sfnt_off0001011e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11930 16444 bytes
SHA-256: a35165e25564f03e2bebcd0569af4babbd8bdd6d962c79b8bdbd76c594d8a96b

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