Malicious PDF — malware analysis report

Static analysis result for SHA-256 a75f9ab092f46e23…

MALICIOUS

PDF

103.0 KB Created: 2021-07-19 02:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 72be687df22207059f34f6889da26c35 SHA-1: 7983f82ab05839d3f946f1c9b2d8eb6e8ce18da0 SHA-256: a75f9ab092f46e23b4909fb143bb91344a8055961beced4c17799e163b02d4af
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, a common tactic for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these external links. No scripts were extracted, but the structure and URL analysis are sufficient to infer a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://madmojo.com/fckupload/file/kosorenesumebole.pdf In PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/9e398e9e5b1d7e000fb23873e97ef09d/35583811614.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a90876d69---15743581835.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d8f68549b---57754124451.pdfIn PDF document text
    • http://webbuilders.com/files/file/89035098394.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c8ae152a9---14453300766.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160922044b56d1---luxezap.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/jmtvkssc9nvc4l0fa2ilf051l1/xomamozukaboluri.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607abd748fee2---54508814340.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e89cb4c5d---5541123106.pdfIn PDF document text
    • https://csn-alliance.com/data/files/mezaviwejonon.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/88835072831.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/d098749ebba3581e17fa790c9b2db0d7/vevezusene.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5942df1b69---xewefimunimebizikafeme.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/zebikemuzopi.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a481b2efafe---suminovaxawuxoxe.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccceb6d451---1741250715.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/mirela.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/50323487722.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/0d6946fe2b1e9da8209f2a21726566e9/93419782769.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/7fdc5b93d5bd1b7cbca9e76132b8d2bd/93523941852.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/78881263640.pdfIn PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/93492621127.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160816fd4cfb89---39947128018.pdfIn PDF document text
    • https://pendekaremas.com/contents//files/laruzugutawopikipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=automatic+writing+meaningPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E2 10524 bytes
SHA-256: dc41ac6bb02def822544580cb1bb9faa777ca630c3434f2d6c586ead2cc2805f
font_01_sfnt_off00013bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BED 2220 bytes
SHA-256: 08094c004e363ac1abc4ca39896604c930a343f5a2af847a941d5dce883e2e70
font_02_sfnt_off000145b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B1 18980 bytes
SHA-256: 8e3d5eb2904e5ae82180f8575c843a0fff97aa9d847bb5cfd141810492d7ae70
font_03_sfnt_off00017601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17601 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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