Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5132db0822bb294…

MALICIOUS

PDF

83.6 KB Created: 2021-09-08 23:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a1fb2e54cf0770b0ac017fd48e39eb3b SHA-1: 68ea8a6eeeeb79571253dafed42273cf8e7274b7 SHA-256: f5132db0822bb294ce54d0623b99fc63d4988e47fe67f331df913e32e5f771f2
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs, such as http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cd6448d31---91086552632.pdf, are likely intended to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bdn10.cz/files/file/julam.pdf In PDF document text
    • http://espwireless.net/uploads/file/94466822527.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/1fb1239d3b9f2b8c706d5aa88d8f5bac/bosamem.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161340f3865278---josadeboz.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/duvolamajipevib.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/ruxewenonofewofom.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/kejejezunazagibunuzuledo.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/jutarajovaboxidupamavuf.pdfIn PDF document text
    • http://primaneighbors.com/userimages/fodonugagafeluseno.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613698023e407---67785056725.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/ea0a54904858fc73d214a3afced0b449/bajuxisenelikaxegaf.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/23872554366.pdfIn PDF document text
    • https://codecs.ro/images/file/ramugejokuv.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/mizagejugatal.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cd6448d31---91086552632.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/bobebe.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/xubenotofanop.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/74977571919.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f25eea60cc---gizowajewexotu.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/74796418434.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/zolow.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/11954184213.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363919c8e4f---fuvixujasasanotifuvaz.pdfIn PDF document text
    • https://lordoptika.hu/files/files/sufofusirit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=wwe+2k19+download+for+android+apkPDF 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_off0000d9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BE 10736 bytes
SHA-256: 22288003cf09eed6d54a9d933be83cfc95e440b75dd8e54b1ea0fdad4bff3503
font_01_sfnt_off0000f2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AC 20176 bytes
SHA-256: 46d268d1e43a640a41cd34af1bd8fcad2d23b6954e96333948722ec602c4da48
font_02_sfnt_off00012846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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