Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d4ae413e4ad541…

MALICIOUS

PDF

81.1 KB Created: 2021-09-03 09:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 27e20206a9425ea47fa78f31cb8157df SHA-1: 9cd4e074934a179a6147c61edb39f1244361a66c SHA-256: a9d4ae413e4ad541e6bde2df97ba636fea282452c5a405d624182f9d77d8d0fe
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content. The presence of numerous external URIs and the 'link farm' heuristics indicate a likely phishing or malware distribution attempt.

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://fisioterapiasuzzara.it/userfiles/files/wobobaxaguwijofukufadime.pdf In PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/29676777427.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/pobaxagifakev.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/ff8bf082ebac2142e4db4131fc0d5975/vanewo.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b37d7adebb---vusewe.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a5168cdedea---vimawisinelonupojuwuf.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021080107053773499.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/0106b60ec5fce3f1b36625b0eae3713a/fivosatufasifibo.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6de6727ad---81952012186.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/14bb5c6e5a69fa62239384f618f9ffcd/53313002481.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f500fd58---dagebeton.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/zekizuvedapo.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/14738413233.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/33440411161.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/46863543452.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/52356147356.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/zotekaromejev.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/37939749225.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/1370500123.pdfIn PDF document text
    • http://intersonik.eu/upload/files/darifunatejefokede.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9ce86b4f4---12771961889.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99382bd704---lagedoju.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/zujakuniwefalub.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/59807373535.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/58606620090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=mekanika+rekayasa+pdfPDF 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_off0000d91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91A 17636 bytes
SHA-256: 07276525437c9a02decb442d47d05e53c92651a93a4203d53233824b29ebc005
font_01_sfnt_off000106cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CF 10428 bytes
SHA-256: b6a5d316b5819cec720d7d3d3fa21238a0f881211875b39b4bc033995fc0051b
font_02_sfnt_off00011e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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