Malicious PDF — malware analysis report

Static analysis result for SHA-256 900ec71949e527f1…

MALICIOUS

PDF

78.1 KB Created: 2021-09-06 22:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e70918b6f73be5c77957efa89bcaacef SHA-1: 5ed8b04093835c06b5a82bf15db1a576953fdcc7 SHA-256: 900ec71949e527f1a95292f75c29c89064938a251ed96ed57fc9bfd68845c8e4
156 Risk Score

Malware Insights

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

The PDF contains a significant number of links, many pointing to disposable hosting and compromised CMS upload directories, indicating a link farm designed to obscure malicious destinations. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of numerous external URIs and link farms suggests an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://amkchem.com/upload/files/13152873305.pdf In PDF document text
    • https://tyko.pl/userfiles/file/xeduko.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2c438195e---56327957952.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca1a4b1406---luzomuw.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/rabidi.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/sovenu.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609471b1e829f---tugojonu.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/1406909679.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/84452922818.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c6af01654---desopisufonode.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/27633336656.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/812387103.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/60130900608.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/61348977286.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/45840786597.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210814222349.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/30801314213.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16120165456fdb---24767064267.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/fekakoguxokizutugofekak.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb63e8ffd9---45648413775.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/revabisagabu.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec38e65ea8---71322517159.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8ec4e5056---gabubekegikizi.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d38f81f0b---fijibibunageneduv.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765e27c09ca---balulogesesiwugorafon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=como+hacer+pdf+editable+desde+illustratorPDF 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_off0000cae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE5 18208 bytes
SHA-256: 16607be745f5a6891c82710136ae52ac0a55ad830304e106d60e429fbd25f6e8
font_01_sfnt_off0000f8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D8 11052 bytes
SHA-256: cb5b71ec182ab1d9013e4e8d66582fb81a11c55d210948097d5ea61ac29e1228
font_02_sfnt_off0001125f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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