Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1130f40c85534d…

MALICIOUS

PDF

71.3 KB Created: 2021-09-04 06:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7752efe58a8e04736d15ca673f1ff5df SHA-1: 2e7f7a94b9a7a51dba71a14c284120f961883b43 SHA-256: 0b1130f40c85534d01b2fa4e82e297fdc367f6d46166a56bedbfdbee85be49b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting it's used to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics (link farm, compromised CMS uploads) strongly suggest a phishing or malware distribution campaign.

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 https://wastran.ru/uplcv?utm_term=sepsis+2016+jama+pdf PDF link annotation
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161254d59a5456---telixapenorevixoganize.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/cks9rbgkmjfnad7f7pm41kfb33/ludumebunu.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021081110580773499.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/zakiwuzixurugamofasafowa.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d69957acc1---josabulagowopolo.pdfIn PDF document text
    • http://www.pvvc.cz/files/32527317584.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/1651910117.pdfIn PDF document text
    • http://absigorta.come/file/84558833165.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/74946911311.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/71202424442.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/77625717683.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/sarijenonefijuv.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/vadijadikepejuxogu.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/vutukasix.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd47003d7e---67102249435.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/98698510402.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/4ec745405273433788df60962eb2576f/49624776707.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/kisadirorujor.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/730858a7fb1fc064428212c342d7a4e9/sutikokepukekosopiwenovul.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/de9c69d2ae59c2d27ddc55436d9d9255/balalebuxizodimefexawi.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/rivajanijugekasulite.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/9f556012bd386000185261d33571ae1e/zirimaxitevetudexirur.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/fosediluxunokunexilalu.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/ridabarukipebixomakotenop.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_off0000b6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E2 10860 bytes
SHA-256: 3f636456042f38493e9dddab067229e0dca9e2ebf3c4276a71085b5588e8c1bb
font_01_sfnt_off0000d006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD006 14864 bytes
SHA-256: f8bf12e848f3a63b44981f0eba41ea93b9d1d654a49136f9ecdd48f3ea87c439
font_02_sfnt_off0000f5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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