Malicious PDF — malware analysis report

Static analysis result for SHA-256 9764f0fb12cb71d9…

MALICIOUS

PDF

85.0 KB Created: 2021-09-13 04:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b65f03c8a6c0abb6ef65e34eb0af1112 SHA-1: 68c69b12c573c9ee5b609ced87e2ad4deb31cec8 SHA-256: 9764f0fb12cb71d9dcc642c43a373b8610de83bd616cc10c772c7f912bf6b4fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users. The PDF structure and embedded links suggest an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4bc5ec9c9---lunipejowiraji.pdf In PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbafb17e95---fepevikilebojufaxabigute.pdfIn PDF document text
    • http://dasbluemchen.com/wokosodu.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/jevasovusagedi.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/85699278464.pdfIn PDF document text
    • https://tepihtrava.rs/files/nusulu.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/jovekafo.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98196650598.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/33448571215.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/56849911015.pdfIn PDF document text
    • https://hssanesteban.cl/files/kobijolodemimalozamukamak.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/zixuzosisosazerajom.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/xamazaxupijofekow.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210906020245450.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/karanegakurofoji.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/98739025400.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/38830486740.pdfIn PDF document text
    • http://odumakus.com/uploads/files/zusiwovebumof.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/51486680047.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/raledapevit.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/raxepifeluteximaxu.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/kiwifesukenipatu.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377bf50e138---nusodowobak.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/towajodupe.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bafa76169c---57125194482.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=gradle+task+assemblePDF 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_off0000dced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCED 22312 bytes
SHA-256: 2cbad0d75d6dc264a5286a8499a7b1503bb5b4fbddd2ddf9f0da5635e04c800d
font_01_sfnt_off000116a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A2 10364 bytes
SHA-256: 4c1ad574dc4b10c2c80302e7f8f6f49370265f108454c2fd48cf840f0e7ba76f
font_02_sfnt_off00012e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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