Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b41d734666fcc5…

MALICIOUS

PDF

88.1 KB Created: 2021-09-19 06:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9ff9e5ca53ce1dad17f08ec36c4e5c28 SHA-1: 7ec0a0c52c2b6ecfb69601564b81e8a6bd851744 SHA-256: c1b41d734666fcc50905c5105b15f9a539bafb41e5422c116d76de6bf27fcf79
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised CMS platforms. The presence of external URIs and link farm heuristics suggests an attempt to direct users to malicious content or phishing sites. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://bya-ingenieria.com/ckfinder/userfiles/files/forivurilosiposunukazeko.pdf In PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/pi2rl87rclk26jrbe4q063tdsa/xofoxisedivufesonuradunub.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/bokugebasu.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/vanuwuzibabusakow.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/27316356186.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/70091689421.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/38319347897.pdfIn PDF document text
    • http://stroi-sistema.ru/img/83538205916.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/73985865082.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/zujilobuwanuvikovuver.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ddcb00ae0---545765965.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d5d213519---57980317179.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/wunabalarudubitunoxuxap.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210914031850.pdfIn PDF document text
    • http://terminsk.by/pics/files/56132338700.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/07044715393.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/forajosobazunasuzorofuwu.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/29320529593.pdfIn PDF document text
    • https://jin-ji.com/upload/files/41073922341.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/51707377918.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/bolavixiludomokokomogafi.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/zabosekivukuro.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210912115425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+unroot+android+emulatorPDF 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_off0000eebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D2 10416 bytes
SHA-256: 1679af176489a06ca3ef8c23c5a110028b3a61151e921f62d88819efde9cc016
font_02_sfnt_off00011e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5C 20108 bytes
SHA-256: 8d134a74c0e8c3e29e48525942b50d6323b9420f9fddcf14bb553d439a9373de

Open this report in the interactive analyzer, or submit your own file for analysis.