Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab0a103ca0b9fe3…

MALICIOUS

PDF

71.7 KB Created: 2021-09-14 07:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8d277d899c8f25fe49097171e96c8847 SHA-1: f4b393263a6d9aa69e2d3c3a2de1e007ad40675e SHA-256: aab0a103ca0b9fe3ab1a03d65d60babcdc9c93639a9372201e6ea308c6c506f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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 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://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/4ei4bm995qb126gro37pc0jlk4/polekep.pdf In PDF document text
    • http://cuiquji.net/d/files/52202824361.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/pejanomupav.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/80732021062.pdfIn PDF document text
    • http://asustainable.com/global/file/fetasupujuv.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/nexarewa.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/83576397588.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d087665671---vofigolipemujarut.pdfIn PDF document text
    • http://nemochem.cn/upload/files/55729152083.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/begimewawuru.pdfIn PDF document text
    • http://kd-council.com/upfile/files/45943640891.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/97033585628.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/tisag.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/18035968493.pdfIn PDF document text
    • https://samowar.ch/upload/file/37767993440.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/53980745526.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/34176146413.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-8/20210908204518625052.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/44084167725.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/39795580365.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/8771512027.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed6751f0a5---40694276213.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/aae40913f262eb95bd727922d47cdcdb/bazudojumewanopatogafeka.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcf71a5f42---turavem.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/xuxuvoduz.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///47924477735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=expo+start+iosPDF 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_off0000b8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E1 10048 bytes
SHA-256: 645a910b38a1a6927525baae3a2d7ec753b630f78883e5e09370321fd7d5773b
font_01_sfnt_off0000cf5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5C 16464 bytes
SHA-256: 5d6f8e3d2d26f9596717b2c8996b87747b54f9a8c60f8e13299005594c59b8c8
font_02_sfnt_off0000f92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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