Malicious PDF — malware analysis report

Static analysis result for SHA-256 988c2422586a9dda…

MALICIOUS

PDF

112.8 KB Created: 2021-06-26 10:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1dbd54aa44a14a24f85cf3837d7788e6 SHA-1: 78f3158f21966d7bec9cc538fe3441ef58c9d84e SHA-256: 988c2422586a9ddab9c392efce0935c19655801f34e9206e00bac20cb2a6fda0
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised and disposable domains, a common technique for distributing phishing lures or malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body is unreadable, but the heuristics and numerous URLs suggest a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://meta-min.com/files/1431646737.pdf In PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/3479356965c5fa1a927058f8f05e6a4f/ginojojobix.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/98f3ccpl71qbum0cdqllhvuvlj/20326260117.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/debop.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/51091468156.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/jrc12kuihc53rsca26sb227je1/wesaj.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/34001576983.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ffb4bfklglg0evmkl4sc1okpv4/41653509378.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f56c208edd---12519555529.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/56899043325.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/c74fbce44e917e56e2ea1d552203cd51/mopefotimotalazaxazoko.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084963bcffe2---vusulonibagokadalavuw.pdfIn PDF document text
    • http://spiregene.com/image/files/20210625_205516.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607906cccb313---60119805810.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb7534ef9c---dokilekulovado.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/39957573974.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/tqdtpvm8jc910ilodkg5crk3rc/5798236868.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/81444916035.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/l7a3jf6dbeiafrmsb7mquico2r/jupevurumipunasar.pdfIn PDF document text
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/dijumanujevi.pdfIn PDF document text
    • https://aspirans.com/files/file/181722062.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/3b4a80e290816203e5efdd3c76d67249/32619799734.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1440a087e---sapoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=a+cholecystectomy+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_off000157b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FC9 10224 bytes
SHA-256: 98886d7f18f1e5d7918b4f8071675d3ad8d56f1c4e60b828bcb462dc372743f5
font_02_sfnt_off000186cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186CC 18728 bytes
SHA-256: d9f442f7ff8e5ac20ad0d20aa6e1014482d5ad3f8930ca04657f4c9caa374c73

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