Malicious PDF — malware analysis report

Static analysis result for SHA-256 98dde6e2777c274f…

MALICIOUS

PDF

84.4 KB Created: 2021-09-21 05:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d3f61d9e97a305aac56bc33dc802b435 SHA-1: 400e98a0d89451d6aa2a9578d980cb3d3e86221d SHA-256: 98dde6e2777c274f86d1ff8c1d2eb4e3e8dc1109af3a642d21feca099969c473
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are hosted on disposable domains or compromised CMS upload directories. This indicates a likely phishing or spam campaign aiming to redirect users to malicious content. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=cara+unlock+andromax+m3y PDF link annotation
    • http://sumtinathholidays.com/admin/uploadfiles/file/jafakoxovukopomix.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/lunifodalimemi.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/40421246294.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/93318433101.pdfIn PDF document text
    • http://calisnt.com/uploads/files/malujegudezinot.pdfIn PDF document text
    • https://cubic.is/userfiles/file/kukutiwe.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/66537712403.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/bezatul.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/jixumerunum.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/tofegarara.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387ce0c1482---32923248869.pdfIn PDF document text
    • http://drironcat.com/images/file/99227059110.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16144a1086f05f---9481497750.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/45759208788.pdfIn PDF document text
    • https://polandpools.com/contents/files/98467777427.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/48293971673.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/boxewarikigezibitowifepew.pdfIn PDF document text
    • http://actinq.nl/upload/file/55267850344.pdfIn PDF document text
    • http://riviera.az/userfiles/file/93945304046.pdfIn PDF document text
    • https://sardiniagreencoast.com/userfiles/file/50271868990.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/3jf34ggoe0a0i9u9v656umag9l/gulejebofinogojoliz.pdfIn PDF document text
    • http://cwesp.biz/upload/file/mosukeme.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/vimonebop.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/54824e9bab6af0490e4b31b9cde67ab3/90752735007.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091823520251.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_off0000e610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE610 17448 bytes
SHA-256: 73cc437a9eba81f8bbd12792a8a6f65ca62cd6155d081cb2542b94e597a8173b
font_01_sfnt_off0001137a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B91 10652 bytes
SHA-256: df603dcaefee356040ee1083c29c95e9e80201f6dcc8459f37652a10c90aa56a

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