Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9467fd50759557…

MALICIOUS

PDF

92.4 KB Created: 2021-08-11 23:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 15026fcc799ed98ff773e7a64da6c2ce SHA-1: 7269cc4720acdf518b9cb15f0f86f8bbf6c26dc3 SHA-256: 8c9467fd5075955741b6226311ec4da9d8e71dffa2306aceee1633dec5c91c59
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting, likely to lure users into downloading further malware or visiting phishing pages. The presence of a 'download button' lure reinforces this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://raptiherbal.com/ckfinder/userfiles/files/76047515927.pdf In PDF document text
    • http://dissanna.com/temp/fckeditor/file/73302376178.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/xiwumagukimop.pdfIn PDF document text
    • https://birudongker.com/contents//files/pazokixasutujaxiwujuno.pdfIn PDF document text
    • http://sam-global.info/files/file/vusatifegi.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/nanoname.pdfIn PDF document text
    • http://scantech3d.com/files/53302706951.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/memurawo.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/ruxofosofusoxapaxiwu.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/wusilifawazuwo.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vanege.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/301304052610.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/95a2b1f8edf07a4cbde251919fc2d8cf/35217670364.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/govarowekazumoke.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/a4b38f201d4d2052d437aa01b370af5e/97364790828.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/91529802698.pdfIn PDF document text
    • http://allycatering.com/userfiles/65606040138.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/7949070491.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/tejukeni.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-7-22/20210722202051397520.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b26a50feb7---67117702377.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/519d99a39e3ffe6c7c5f5a113dba0dca/23462201595.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/lusirorexegidakafiwanid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+essential+theatre+10th+edition+pdf+free+downloadPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f2fbb944c---fuwativamumuserananeladal.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC00 10816 bytes
SHA-256: 7d79124cacefadf599f8638fc5ce1981993a40a984adb96a4623241c8e270997
font_01_sfnt_off000104f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F9 18392 bytes
SHA-256: 6a0a98c54c0972f3bce968940cc04d31762188f4e0775444681bfa6b6c287239
font_02_sfnt_off000135f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E01 16084 bytes
SHA-256: a79c9caf7d9fe7d7e6557dd08284a48a0650ee9668136fadcfdab94fba17ddb2