Malicious PDF — malware analysis report

Static analysis result for SHA-256 a380b56608b79a37…

MALICIOUS

PDF

84.9 KB Created: 2021-09-16 16:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ecf2da988c8cd6061844489c8d1dfe92 SHA-1: 0acb5876bd931b6be6344004205a7590dc742760 SHA-256: a380b56608b79a376ecfd7fd311abf53f800aedb3c2caa89947467ab299b283e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://edeins.com/userfiles/file/jotigoj.pdf In PDF document text
    • https://acavacecio.it/userfiles/files/25035112844.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/35287516566.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bubigasixudoloriwijamos.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/99297792684.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/af6f272b3564cbd875f74140a75db00b/fizavabowedivilebivag.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/darosonilobabojafoba.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/memugagofawajujita.pdfIn PDF document text
    • https://eetravel.net/file/25416155896.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/81089866313.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/44736019540.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/lizivolenitexasewudu.pdfIn PDF document text
    • http://wohntraumgmbh.at/xupova.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/3184465895.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/sizefowutogove.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/a1ff448d93f2c856302e68b703b117cf/moxojuzekupapeludixa.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161425101843ed---sidik.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/jatisoweguvu.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/46231682185.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/70484125192.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133d9337d1da---xepidisupe.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/5325544285.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/05/file/20210905_025806_152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+do+you+make+a+playlist+on+an+android+phonePDF 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_off0000e616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE616 17620 bytes
SHA-256: a5796d28511e88f759e56e79a2009c28ce3a5d21f47599b471f98161fc4f88e1
font_01_sfnt_off0001142c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142C 11040 bytes
SHA-256: ac8a7b2c3dc11bfc33f5f7639a0c5ab2f3a9cc319de91f61706bd017b804f80a
font_02_sfnt_off00012db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1