Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cef6c6f2320326a…

MALICIOUS

PDF

77.3 KB Created: 2021-09-18 09:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e765c11d00ecb3e7f71054f1e2b13fe2 SHA-1: 509aba3a12a28ba74d0dbb7a14bd88dd5f79be90 SHA-256: 3cef6c6f2320326a35ca0b4aca591c64d8099689f401441a3ab3155becf3f5ec
196 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely a phishing or malware distribution lure. No scripts were extracted, but the heuristic firings point to a social engineering attack leveraging external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://dunajecbiala.pl/upload/File/daladobepowutavixotasal.pdf In PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139605995233---kevewexedapigima.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/zonojiromupuruwuwok.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cb2cf1a8c---34214281759.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///12681289648.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/17818809089.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/99121895622.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/93215887473.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/43797894022.pdfIn PDF document text
    • https://chineseclothingonline.com/File/14609294457.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/pukul.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/42822551802.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457a83d82fe---lapomu.pdfIn PDF document text
    • http://soupworld.de/upload/file/59451146787.pdfIn PDF document text
    • https://shinaltd.ru/images/file/remewa.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/65763122070.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/16023648353.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/vijijas.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/1487416510.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/508e1348252d041d72cd23f193979e34/34239612635.pdfIn PDF document text
    • http://asfalon.com/__files/file/verosujemimemuwubat.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/pawigokawidomedenufovavoz.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210916081705.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/jexuvapob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=magiccall+voice+changer+apkPDF 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_off0000c602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC602 10540 bytes
SHA-256: feaa3205682454ac160a6edcf7443520f8af3d1ecaa8395605115ac3b052d1fc
font_01_sfnt_off0000ddf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF1 18896 bytes
SHA-256: 85556b5d74e85f610832d5474e8e4ded2079c17fb07c1d1497370271652a1253
font_02_sfnt_off00010f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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