Malicious PDF — malware analysis report

Static analysis result for SHA-256 19523b92b3a9fd2f…

MALICIOUS

PDF

75.2 KB Created: 2021-09-19 00:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6dfa73c9fce86dc3d1095514f6eb2b7d SHA-1: 6765133484f827e711ec80f4724714e6283814a8 SHA-256: 19523b92b3a9fd2fda275a7efbb56a795e03674a9faf5f516ac6e71533e73f6c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ledins.lv/cms/file/61708434277.pdf In PDF document text
    • https://techson-cctv.com/upload/file/23981865010.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/21842402425.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/tupapifomoxe.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415931bf6c5---89821853142.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/59653720137.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7cfec0da8---mixobijuwonofijukozapo.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8738002e8---15567283664.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145859d4e016---wewules.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/lopovunenuka.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/23071029777.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/35291659155.pdfIn PDF document text
    • https://majubesar.net/contents/files/zezaxelega.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/vanuxafubigoseturaxe.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/7824093569.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109181602413415.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/kugowosowitidupaxalab.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/77351409677.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/19429269528.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/wifemubopunizoradifatud.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/35336138845.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/61603122651.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/vazafuvumudilerasopo.pdfIn PDF document text
    • https://sergiomauri.com/images/file/93878437065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=reward+robux+promo+codes+2021PDF 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_off0000c148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC148 16624 bytes
SHA-256: eb8dfaea9be62688b0da3d62a839c9a49b15e1ddffdfcb2e97c804928853774e
font_01_sfnt_off0000ecd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD0 11100 bytes
SHA-256: 2cd4478e7b24842fdbefaaed285581bfbda981a0fb1a29183ddf8aa76819fb88
font_02_sfnt_off000106ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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