Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b888e6b0548d2f…

MALICIOUS

PDF

80.9 KB Created: 2021-09-05 22:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 9ff9aeebe74f7d19985e55d12f546ff0 SHA-1: a52e71a2d78b4cb8629d39a9a663905f9fc60fb8 SHA-256: 61b888e6b0548d2f486456c1cfd958a3b8d3a3d92f1650522a967193f16a93f0
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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 http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/pupesowugujap.pdf In PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/63552293792.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/13562645700.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/tazalixoruzedowizuxubi.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/funusivexusobepixekege.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/33467812678.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/lazatenin.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/93067394527.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/19594682383.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/tutufijiwalonoji.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/72987194959.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/xexoravijizefiju.pdfIn PDF document text
    • https://bauarch.bg/files/lugerawos.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612aa4240ef29---1778010692.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/pigodupovineworosuv.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f077e1df601---xepefogipore.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/fuwivanewaweguneso.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/likuzulanaxizuvijabu.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/4992026442.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78368b3bd7---91314633602.pdfIn PDF document text
    • https://manenshop.com/upload/files/92803166356.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/dazikobinanajinogamogum.pdfIn PDF document text
    • http://effektfilm.de/files/file/lajuwafesepur.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/49162117504.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16127cc15274b7---dubajepoberezoroti.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/86640687859.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/78831826278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=dresden+files+rpg+pdf+download+freePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D1 10664 bytes
SHA-256: 92c52705eae836040ecec301e64dfe08b30cf961f82049c9ed0b63b2ef5f8803
font_02_sfnt_off0001002e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002E 16764 bytes
SHA-256: 7b5b3c5c45080a1ae4d086e3864491ccf937aaf866ad0ae58ba032b88d3f4037
font_03_sfnt_off00012b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9F 2044 bytes
SHA-256: 97a693020a9c67c913fa5abf5d83a61848c846aa130c5182d8e66f233602b60d