Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c78e62c3c8936f3…

MALICIOUS

PDF

79.3 KB Created: 2021-09-07 15:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1058fb2c6199b33a88eff75ed92b9804 SHA-1: 4e3f5ac2b7797013ff0398d77f19079150d67783 SHA-256: 3c78e62c3c8936f3f08561b062c223b3bf06ea0b3128d6c5c729cc5012bd4682
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple compromised websites, many of which are hosted on disposable domains or use formcraft plugins for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a497122fb24---47321910772.pdf In PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/29351446430.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c412f524ee4---gedazizumumivilawaxaw.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/konusisofatujurugexuwiber.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/376ad67a72bc68a24bf948491c689c8e/leraz.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/mepuzazudobavujirapiv.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/360eb2f7765df2013d64799ed5580c81/92044970840.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/m870er9hsjl3ha3cc56ghlimb3/lanomosesoxumigurixemo.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ddde037925fbc4d27bfad7026c1ceb63/pelarokapo.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/37677536984.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/39127177734.pdfIn PDF document text
    • http://thefjordbaklawfirm.com/clients/876731/File/xirivaxukufofosalakun.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/wegisopefoketatixugufovux.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/kafegido.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ao17es2f61p9tmalicbbjo3b03/64636628027.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a07b981847b---70707671983.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/tarupe.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/73883281137.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/jcnurdii29h3lo5e31t69omv26/pekege.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/85938277342.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/sobozosovanidetewiwumob.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/zewadezunajezabep.pdfIn PDF document text
    • http://attlas.center/userfiles/file/zesalaromexebuz.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/91579207741.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/8e26ab1b943d929c084995c74fac327a/muxabepesuxixumagalejenal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=zeiss+55mm+f%2F1.4+otus+distagon+manual+focus+lensPDF 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_off0000cf33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF33 17612 bytes
SHA-256: 7bd3686ad4391ca0532f1d2e2a3ada748e5b7efbe19e09e030c4471a9b80a21f
font_01_sfnt_off0000fcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD4 11148 bytes
SHA-256: 9f3279abe5f28a63119472846e26eae7547d393fea31601e4abf408ac9a16f51
font_02_sfnt_off000116e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1