Malicious PDF — malware analysis report

Static analysis result for SHA-256 b914ca25d9f23349…

MALICIOUS

PDF

91.0 KB Created: 2021-06-27 10:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 00ae92b60606d9a9146bcb46e9b3d194 SHA-1: 3bd5e49299243577fd3bf98bca4e568dbc2cf46c SHA-256: b914ca25d9f2334929ae3f4e20c64bd03aa55f24fbaca8bbcaef110b14490ec9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to PDF files hosted on compromised WordPress sites. This suggests the document is part of a phishing campaign designed to trick users into downloading further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/8fc0df0b2607afbaa42653c71781566c/57336009147.pdf In PDF document text
    • http://vitacanes.com/uploads/files/12997442264.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/dadefu.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4e3453732---38583316514.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/502de724059fc35b8f169bdc8bdd04bc/jazepav.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fed500ce0c---45831482571.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/tezanabopugizafun.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/6d989fb695a218dbcf95a9d3d72e0923/73950836932.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a009557cc36---waxawobitizeza.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/8aed48a0b9bd29a1f85d10bd08f3daac/84626918059.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/588b7bc3fca57ecefdfc3ea9c50d4539/fakema.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb75257fb77---wesalatejoxixezanotetepu.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/2af7a6a8d5eeb8058d8b525103b4fa48/xenasabapepikozukadogel.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f849c8944---65880507723.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210524052324.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/48d044da1ae040e9b647f179b3d8e2d2/73102073756.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/d2ae2c5968a74542bd0340d73fa90922/xelakuw.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/8inuc0lp2ukfdevuonfufvht32/mojijatepag.pdfIn PDF document text
    • https://room12shio4.com/contents//files/93888181408.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/42203163901.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/h74c1k6ih0j8c9vsuo7rvks7r8/mewinu.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/506mnpknkup38jeinnvoaoutfg/febajedidif.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/9d260bfa059a64f48f1af22399177b4b/vakexixu.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/5e78bf5f9fc9290265075dbca8d954ad/vogolozevibesopoduta.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a4adc91cc6f---70753524783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=my+favourite+animal+is+a+dogPDF 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_off0000e96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96D 16488 bytes
SHA-256: d0e02ea597b059e12c640018e4c0b859d2fbe31b167f59dc9fd0dc6423c65742
font_01_sfnt_off00010055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10055 17072 bytes
SHA-256: 07afe699db2b3c9d42bc63534ceaa4498b4b4b390b8309d9124fe3188efb05b5
font_02_sfnt_off00012ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA5 10968 bytes
SHA-256: fca700a19cb981f556982231607c11612ec366c2de38fbd279c0b29b94e03737
font_03_sfnt_off000145ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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