Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8a7605040f7b72…

MALICIOUS

PDF

88.4 KB Created: 2021-07-01 01:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 546f0033648c9b68a2b6d4279e0cf958 SHA-1: 7d793ffdda5e02e2d0e15074df78be71ea05edf9 SHA-256: df8a7605040f7b7266021019df4d1c5bf732c9b9c0d695d0732429ae7222f5f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting sites, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://mhinflatable.com/upload/file/17362594402.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fca26865e---18251507493.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-12/20210512015047678153.pdf
    • http://sivam.pl/files/file/26097613143.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce3a6e31e0---nobozar.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160799ab1b7d85---duzamutanimajuxikoretorem.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32df55093---likegajavipizuvuk.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608026080c283---58151507541.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d7bd09cf330---81865512875.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab66a9c0ce---79738931909.pdf
    • http://ceresasrl.it/userfiles/files/74798597088.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160733861f16c2---femenojegevubopikonevo.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/d22e89ae592836d71197d624bc416c1e/44988746315.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076d83d0d32b---jojobolobobalebeva.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/qo9pkhr9fp228ckm7kihbs4tja/sizifipasafudebifonafok.pdf
    • http://dui-antidote.net/images/userfiles/file/46511399149.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b50ad6e22---modudofura.pdf
    • http://www.darvidproperty.com/news/file/47025789839.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b95595938---70532930641.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608868800049d---tufulemojepibepifofi.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e721e25d56---38595871570.pdf
    • https://pjkconstruction.ca/images/file/sagaxubuw.pdf
    • http://ff-engineering.com/userfiles/files/gaxiwasefisevejokisug.pdf
    • http://au-coeur-du-temps.com/userfiles/file/tedomoj.pdf
    • https://genericdiabeticteststrips.com/userfiles/files/gopiponixuniwiwamokoso.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=class+9+chemistry+chapter+1+test+yourself
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f531.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF531 16792 bytes
font_01_sfnt_off00010d48.bin
01eb9d5d473793f7128477c04c90741ce09aeb1731e4dac2c40b6669556f8ea4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D48 11108 bytes
font_02_sfnt_off00012747.bin
3ef1be9522507840e7ef3a955dbac14445914dcdd197c2cbf5d9c0662159db52
pdf-font-stream PDF embedded font (sfnt) at offset 0x12747 17152 bytes