Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0102a1451e5d794…

MALICIOUS

PDF

88.7 KB Created: 2021-07-23 04:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a998072b18bb6af7217194d0ec60f6db SHA-1: 62a21591e9562342b4b60e40391e7421fe319fed SHA-256: a0102a1451e5d794df0f1b651ee611be449a6720cbb3e7e5788464b670ee8262
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm on disposable hosting, with numerous URLs pointing to compromised WordPress installations. The embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/vucbl6bbqikc96p54vm1k5sci0/tenesisarozukukezu.pdf In PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/4a3a03d6bcd30e332818b74be25031af/sekimugig.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/o35q2ghrglkrrro26c8c57l1fi/178199799.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/e63c34764d87e861e0a8df4f1a466d2e/mudomivew.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc6586c62a---napufaxovaru.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084940f8b76f---jumafoxaweta.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a667c5de231---kuwarewidekiriluliw.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/lazaxegot.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/napuzujugozurulifaw.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/7431712b50e79c9ec69a520dfa88b177/lananijonobopilon.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160857415a890c---8006332817.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/31215980119.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/48941882666.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/835ja3mcsf0scje2dcl67pfrt3/63646651164.pdfIn PDF document text
    • https://hagepoorter.be/files/files/mimigajibobevufize.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606fce3e79e70---govavikuzujigojebevaminen.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a84837316---ziwavizotosuji.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/82617267950.pdfIn PDF document text
    • https://osakadentalcare.com/contents//files/59195814753.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/kkv7k96ki1tm56avi14v7p8dbu/dapizazegabulupubagirat.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a899b4e27dd---bosuxel.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/951230fca69001e19f5ea25c8278e068/rubopigobojobesabejuguj.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/6dcbdf144af909bed248ee47447c0806/tofavukogozasoterurum.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/ravagopokibid.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/16457971809.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/89950243856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+smallest+multiple+of+6+isPDF 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_off0000f28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 18068 bytes
SHA-256: fd42c171d17d6dd06a6cdb270efb8edca149d3757f168dd750d1838244bd6b2e
font_01_sfnt_off00012222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A39 10652 bytes
SHA-256: 7da38586d98602e218a248db5adaada37a03445791109b0ec832483c74b06f84

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