Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc59e62cf8dbc3c8…

MALICIOUS

PDF

82.4 KB Created: 2021-09-12 01:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: da8a29b19794d4401bfcecdf35b27ef2 SHA-1: af610acb6cea132a9545767480b74f332be1ac35 SHA-256: cc59e62cf8dbc3c8fa5ff1e6443ccc1408e45e38b8b8cb4d42e222243b48285c
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm hosted on disposable or compromised domains, designed to redirect users to other malicious PDFs. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5210

Heuristics 5

  • 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
  • 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://philabc.ru/uplcv?utm_term=solve+for+x+calculator+triangle PDF link annotation
    • http://explosivedevices.ru/media/file/fojaniga.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/depunarepi.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/87210916612.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/nozujun.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/96767496815.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/teromajoj.pdfIn PDF document text
    • http://keacg.com/upload/files/pixusuketululupes.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e698e9f4b---49946797129.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/lunazukofitafizel.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/lepuzegokon.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/tewuve.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/92092665959.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe0df937b7---doredisowokusinu.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/20989286610.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613480674ca7d---83289375133.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/93372536015.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/fevumevuroxubazita.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/85431765875.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/53717552263.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613d25153436a---majeruwejo.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/fenav.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/xividedab.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/gokeputugopixesewasujorev.pdfIn PDF document text
    • http://df-2.de/images/daten/file/niwapujeripolisu.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7625899e3f3758de8aa6afb62056de94/38548837159.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/75563748352.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/jujoledovibigebezazatuku.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/53233616712.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74D 10684 bytes
SHA-256: 3ce76ae1d5522f8d3c1fd21accbbcbcd93298ad95179075554b4bd17b8ea89f4
font_01_sfnt_off00011004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1