Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a7983bc10228b8…

MALICIOUS

PDF

82.7 KB Created: 2021-06-28 12:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9a07612ecefb6f6684820fcb17efb489 SHA-1: 22a8224893f85f24aeec28f2a9320798772a4e8e SHA-256: 70a7983bc10228b8a539a21e26d73c6b02539a591c4cd1e8ea00246f7a42a1c2
156 Risk Score

Malware Insights

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

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 a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple external URIs and the 'link farm' heuristics strongly indicate a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/bd77407c684b2fe9c68755df38ac54bd/xelazotutiji.pdf In PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91e3aac98---52354715219.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/fvhnhofepcuebt7lps7iugfsj7/26037738405.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/lefazofo.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/48d15dd28ea20cb1c42717fc1cc3c46e/32841130996.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/80eb1ed6d40fb2cfdba32dbd14dfaa2a/fiwozisiwinakuzirafo.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/e3emn096k23th18abe6f3e35r6/kulokakulokemo.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/garimupoxek.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/52u92ld7aiiivq30hgduc6qof4/40657072258.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/tibegozex.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096e80226619---18199297566.pdfIn PDF document text
    • https://kultmotor.hu/images/files/27451262570.pdfIn PDF document text
    • http://rhondachem.com/d/files/26143909365.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/d5srfvh586qcm2bh5mn6bqf647/luteferuzevadodibukisov.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac7f403621---18110133815.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/tipefew.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/xibigodik.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/13367035139.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/d2c25f6ed0c3851461deac9f9ff5ea4b/numomov.pdfIn PDF document text
    • https://combrooncom.com/contents//files/xifuzajafufozurud.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a749fb26e06---38113409099.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+place+value+of+the+underlined+digitPDF 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_off0000dd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD89 10860 bytes
SHA-256: ab7ac1fc41b3b817acb99c16cc3cc0c64d1a597ef144eedc9767e4fabfb56876
font_01_sfnt_off0000f65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E70 17884 bytes
SHA-256: 1726d89ee0463bab002394da3a9eff32896887f49c562a66de1dc7a242afaaa3

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