Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6505b07bb9b1f1f…

MALICIOUS

PDF

114.3 KB Created: 2021-09-01 10:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9a633ce8bbeea21e42f1a7780e1396e2 SHA-1: ba7636dcfb49f5d375f63e2faa222f3f599f066f SHA-256: f6505b07bb9b1f1f9034b05e0aa8825b415a1dbcc96b2fd4da8f92e87ed83fa6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting. These links are likely used to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://slsnn.ru/content/file/kekofafogelarel.pdf In PDF document text
    • http://bigband-ulm.de/userfiles/files/gegiviwezavosanavin.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609409da09f5c---lafalane.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/fosumixisegalipufisovomed.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea3a106aa3---gegegunak.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094fecd6739c---japabowitawudara.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/jjjpo03ri5r7ial1neqjboudb1/nixavaxexebovovosew.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/31470f2cec5f79d080da21b0fa5de7bc/36246458983.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608097ecc1bca---najoxerepanosejodijivonir.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210714_4BF0BC103A7DEB39.pdfIn PDF document text
    • https://istanajp2.com/contents//files/jivagigipovapewavejamen.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/sebole.pdfIn PDF document text
    • http://ave-france.com/pics/files/99275434516.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bf4162b08ee---wubamilijumudozapa.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/k1hdhn3alr6gp12t9r676vo1s6/pinanamosoxezevej.pdfIn PDF document text
    • http://deficanderel.com/clients/6/67/674a09facce11b7629d390eef9534ff9/File/89081765709.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/levovibexoboxo.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/85529547226.pdfIn PDF document text
    • http://cabini.it/userfiles/files/22386036247.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ss4o9fbqtro5lnc2quq4krgel7/funamasibazedop.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/tudovemamoboma.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6f5f965f8---woluwaz.pdfIn PDF document text
    • http://health-bridge.in/upload/file/fesubapolewefofobamij.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/30156463145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=swamp+boats+with+big+fansPDF 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_off00014e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16646 22416 bytes
SHA-256: f86206d8fa5cb81f0e059a4be1a60c63114212e594e31b0e28d378d1813192cb
font_02_sfnt_off0001a1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1A4 10828 bytes
SHA-256: b76f714cfba06947a4a4a8696d3c4f06d9d70af7babf966c1baaea1db09f7a65