Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3d7f21a9c763d1…

MALICIOUS

PDF

88.6 KB Created: 2021-06-30 01:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 326f3b2f36a500317f6173e970d0b2be SHA-1: a4c2f0912068b15cda24fdeb023ae9f02dcf5cdc SHA-256: 3c3d7f21a9c763d18ef9d2b708ee51ef33b3236e63d6532a8c3b6fece6408a3e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with many embedded URLs pointing to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and link farms points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://medob.org/SITE/files/editor/file/50404477780.pdf In PDF document text
    • http://ampletrekking.com/userfiles/file/5080467298.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/7c4e3abed06513bac418b0263f390b09/78793374555.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/37416627054.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ecd89ddcd---11506982557.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c268190586---kakevegurefidugud.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/buzozegazamunopowe.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8b5b53ba6---9867494842.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/a7939a7ce4aefe97c9691c7d8d8f3777/86715157714.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ce47e00ac---96194378314.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/16921177962.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160700f108b9e4---belamefotaranololufurob.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cff392fbf---wisevedimosagenilopag.pdfIn PDF document text
    • http://stylekd.ru/files/nemawarekenovumedimogavoj.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/xuvaluvixobegubutijuvis.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/n8h46tfb8rfp1nku8ohu6thml1/27377644650.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ef3d34d63---55105536750.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/49dee6664370ea187c43be40d70b6590/2838223370.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/86213847759.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16098786030e5b---12893521484.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/77345193166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+find+my+tabletPDF 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_off0000f7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B2 10580 bytes
SHA-256: 247b4a528c04b4ac4b21e5d87b33b7cb2d9c05d5276f467ebc8751d4eeee8506
font_01_sfnt_off00010fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD1 17320 bytes
SHA-256: 01a4750cbd38019599e268434ad7783cf8314cdc7b9622124edfd0cfdbdc218c
font_02_sfnt_off00013d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.