Malicious PDF — malware analysis report

Static analysis result for SHA-256 38573d8d02743689…

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 23:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: efba546e4c15213d1ff4e234867dc805 SHA-1: 2f0ae750db031232a12aee4ad7301083f1f18d92 SHA-256: 38573d8d0274368906ec89dda4a56116db547f66bd5a0d81d618afca171f6903
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=convert+and+combine+word+files+to+pdf PDF link annotation
    • http://satisfytech.com/ck/upload/files/5000486476.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161049da397fe3---52315646173.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/romadiketikuju.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/juzukisikadiboxufevoranuz.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/161006ff0068a3---pevulodopib.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/58296522273.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/rijerosepazelubevowin.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/94592647597.pdfIn PDF document text
    • http://ukrfirework.com/images/file/bobobe.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/161275fddc8c9e---mukizojesupofeworez.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/9336558280.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/96726485225.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/dulafanelolatitadenisije.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210720043850.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/xevupi.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/jesaf.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c37fa3b08a1---zezevivowuporoxomip.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607de0558ebf5---fivunetanufivuzeti.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/pezikenawupofazokipifele.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16093c2fb8485b---11054275336.pdfIn PDF document text
    • http://hidropro.hu/upload/kupifusaxurudi.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/73e8253db6f45d7587d4830b8319a016/97336647052.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/f08d03c0537d75bd361540b757d66028/bujasabodaxubutajuvaro.pdfIn PDF document text
    • https://bor-diing.com/upload/files/wepozem.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_off0000da6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6B 17428 bytes
SHA-256: 9cb1d37d530c41a684490262804d8f0dfdde9d4f6c095230866a6cef583128b0
font_01_sfnt_off000106b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 11104 bytes
SHA-256: 9300ac89b1fb1112d52b2670ec592ef11a6bd4c2d2070ecd55afc152ab4ff783
font_02_sfnt_off00012076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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