Malicious PDF — malware analysis report

Static analysis result for SHA-256 048970f1685ddd6c…

MALICIOUS

PDF

78.5 KB Created: 2021-09-02 20:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 16d37d080ccbdf937764bc4d538bfdd3 SHA-1: ca7ba301a31259f7b04c68911401aee466a2b68a SHA-256: 048970f1685ddd6ca48d33cde23a42e3be3fbdbd20361f5b95a18bc20f7fba52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=blue+moon+of+kentucky+chords+pdf PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841a75c7a54---joxipuzezeg.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/00488fc52d51a0a91fc25aac1c3f4d90/9605913869.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/90633480021.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/vojevunerijunipugu.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0270ab94d7---58190435342.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f235d562fc0---najizibagika.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf1d44c859---75276397393.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/qo5fnuudcbavv3q97qle7b61v3/numikalupoziwidi.pdfIn PDF document text
    • https://premium-house.uz/images/file/76724138347.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/57964241794.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/sigusaturukolu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611637bb3f5dd---vikarotu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7632a65f4---zovasaginonidope.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/98118536628.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/7a65f06b6a67ccd3dd9ef32c365bc90b/weribovitafezonipibifikud.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081464f208f4---7799956176.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/63425690040.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/betaguzo.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/kuwug.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bad9e3ef6---jidonesipojejalodapaluja.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845ced859ee---sixur.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/75566016871.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9257b1864---86027394651.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/morerumawimefojasomi.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/muzapa.pdfIn PDF document text
    • 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_off0000cef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF8 10988 bytes
SHA-256: 927c7537fcada51f46e70cb03f7daf8fde08e48f7bf9be45e8e37c695652ff54
font_01_sfnt_off0000e863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE863 16708 bytes
SHA-256: a43144ac004e9615082f8ce601122aa6e597e6d938660fa6bf4d32f6528be3bf
font_02_sfnt_off0001140a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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