Malicious PDF — malware analysis report

Static analysis result for SHA-256 f833fc8337d4431d…

MALICIOUS

PDF

88.1 KB Created: 2021-08-19 04:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7b2a908706f7aefa353141fc9ff339ca SHA-1: 6af453f003da294aa299473821fdfc8ffa9d7d86 SHA-256: f833fc8337d4431d8a16fedf21ff79c2fc2b2449b50f57f4738b60366431ec10
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites, suggesting an attempt to distribute further malicious content or phish for information. The presence of external URIs and link farms indicates a likely attempt to redirect the user to malicious sites for payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://daiichitravel.com/uploads/news_file/sewololutofunid.pdf In PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab7fb14440---67101990910.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076780dcb8ca---81162015820.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/9353050444.pdfIn PDF document text
    • https://parkettworld.com/upload/files/98921331463.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083eb66ac083---fotuxuwizon.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/43936757950.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/23553976525.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/boralebusovubotaredub.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/1c1391fb3e5fa96f0842d6ac9c7325b7/vemawanip.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870018d0206---viwolorafafufozab.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/318cb2802135165f7c73dcb66aaffc6f/6345271636.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/um4vckvs3tcgo8v477dr4f699g/niputobesu.pdfIn PDF document text
    • http://davcpundri.com/css/file/17262302525.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/welokeruvosilowibobek.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/37638177053.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/6qfti9u3btr1mpg1bhfin6hsnm/17018961007.pdfIn PDF document text
    • http://jarosi.hu/files/file/15658984762.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/8u1mp20s1nc58ch7p5o422f37c/12109621567.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160accb935868e---21247068407.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9e1b52c41---97302221072.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160915de343531---xivonipokaxadinuwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sketchup+pro+2020+full+crack+free+download+64+bitPDF 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_off0000f299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF299 17100 bytes
SHA-256: be60bb8b28ba0cfcc1389222e5344f8c7ab36d89dc0fd60f648b6e6c0b870a98
font_01_sfnt_off00011edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F4 11532 bytes
SHA-256: a5b7bb1c6138e7095f03305f19355c52c85ba09adf31afaba0b39ee05ab0d4df

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