Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d6933d4a16b3c5f…

MALICIOUS

PDF

88.5 KB Created: 2021-09-08 06:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a4a3aab39268056458939609f572a0d7 SHA-1: 1bb6cf0322e6f0f6a3f5792005557c68fe545fc0 SHA-256: 8d6933d4a16b3c5f0a5bb96179708dfda4f325a3f23e915a070734341970613f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure the true origin of the malicious content. The presence of embedded URLs and the overall structure strongly suggest this document is intended to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=gps+tracker+103+manual+portugues PDF link annotation
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608588ec5bc80---10644053635.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/98780607002.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/wugorizimurogaxu.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/d3b5ec9a8add460dd6f9f5ddf00af7c2/gogigolezofobusi.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b73b457894---xipura.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/32654783672.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/654f6ead7b7f74803340af35d6f04dbb/80600284866.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/sifurutosijizabixewezo.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160905afdb51ec---nerajegirot.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/lezinuvizufu.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210802113756_nkxlln.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/51923956765.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c90b029989---sajefimilavawa.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db2d6495277---fadivonakoranijasorobo.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/502cdfcd121b212c2eed23ade98b2a83/liletorag.pdfIn PDF document text
    • http://falerisztika.hu/tmp/fetibagajelufup.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/mupipezoniberujo.pdfIn PDF document text
    • http://email-database.info/userfiles/file/5395289102.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d291946799c---27642269063.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/27887146919.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1611ef60b7498e---pifekebotamesal.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/33468780385.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/70946661959.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/oohtuaraltp78155shqla60pf5/66642142348.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_off0000eb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB51 20668 bytes
SHA-256: dc8592d422a412eeb7202507206d5c009e070bf881fb7cb22d8e001b9a86abbf
font_01_sfnt_off0001220e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A25 11204 bytes
SHA-256: 9bd6dc72f57446be893c770506e2b5557da00b93d265ab7fc8e4912d07e7c6fb

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