Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc7c39379964bac3…

MALICIOUS

PDF

83.2 KB Created: 2021-07-23 23:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 652b024bd8a77677828e2625294bce2e SHA-1: a3183e9af9699c98f719488718d2dd950879e5fe SHA-256: dc7c39379964bac3139058dcd83b9f99a508d6b70f46c6669c498023451fd020
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/def0a0c73a97e070fd9fbb3f6a03e272/vinusidi.pdf In PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/64d786f4ecbd92eb6f34bbfab0e4418b/19827020193.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16081d5ed324c0---96142082830.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/zepawulogop.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/64710629049.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609add33bf0dd---seferufoxaligefidap.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070931840015---reribe.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/nurafosu.pdfIn PDF document text
    • http://techbis.pl/files/file/fubazadot.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/6141434939.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/94051535573.pdfIn PDF document text
    • http://inse.us/uploads/images//files/54036655352.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/14595017551.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/6b72990b87c171cbab9813c87ce2be1c/bavira.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1b0b493bbe---65765474241.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/losaruzuzufom.pdfIn PDF document text
    • http://tuccifamilyonline.com/clients/b/b5/b5aed9f4ae8fd2b300021b46b426cae6/File/tatol.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728dc09fdbd---pujikikazenewuz.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/52694277337.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/75keo0t34k7l1egqrc6ajea9da/kekapewuduxawari.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/cc89e7f3393cceceb8ce9c86d7983f41/14885733488.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a9bdab33c---57928875876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=scarlet+ibis+imagery+quotesPDF 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_off0000e10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10F 11044 bytes
SHA-256: 9d5411a02a034530645cf00879ec442d86c2c26bd6c26b03607010d4685ae240
font_01_sfnt_off0000fa80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA80 16772 bytes
SHA-256: 2f925342f07803237b83a9bf477b58c968cc4e99c6a6b0f8dbec38b18e636bd5
font_02_sfnt_off0001261d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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