Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc460b262215c133…

MALICIOUS

PDF

83.1 KB Created: 2021-09-12 13:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3da73879bba65bbe5af9d2ef5d2b5aaa SHA-1: 0af1f13658c74514d65793b39f8c500ee1b92ba9 SHA-256: cc460b262215c1337d3f37787c293f0e6d75ee6a77303e5b9b48b7a77a7d0ce6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with attempts to exploit users via malicious links.

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://coretry.ru/uplcv?utm_term=shareit+without+bluetooth PDF link annotation
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16133d77f1ef74---vegizurigakigumikujusobal.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138211a2cf0c---todovikeponofub.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/74984706cf25bd84569aad9b197bd07a/1207517367.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/59943369828.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/77322148610.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/87728891909.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/60547982142.pdfIn PDF document text
    • https://eventaipei.com/upload/files/85279157951.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/wegutedukiliv.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/lijemovomapajixinapuf.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/69921054472.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/68959557833.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/toxopa.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/76392735407.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/15832799373.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/73052966182.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/datemusus.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/58428304372.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/nazukudas.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/69fb40d2266ec6e4f8c9d650ffc8f983/98659701857.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/98784601054.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/suratuxajumive.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/70070327752.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/4959288d570615d79cc0c5df8e90cd72.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_off0000e21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21D 17744 bytes
SHA-256: 3ad9ae1023daedc424460497e8f1ab337356fcc0f6b0a0e9f19d4633cbb70440
font_01_sfnt_off00010f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F90 10336 bytes
SHA-256: c3b7d5e275825a3b926913e9c50c06ec6837f035b7a88abfb9bc96d8318909ad
font_02_sfnt_off00012712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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