Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1cfab115bac6d8…

MALICIOUS

PDF

69.2 KB Created: 2021-09-30 23:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 12a73c3d3ce8d925cae305c53188b350 SHA-1: 867792039ac847f59a9cdbc11ff12121a388f6a9 SHA-256: bb1cfab115bac6d870de990508198a26ca3e38d535919ce4578667abde6d45ed
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous links to external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content or download further stages. The ClamAV detection and ML classifier further support its malicious nature, indicating it likely functions as a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5076

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://synerhu.ru/uplcv?utm_term=how+can+i+watch+mx+player+on+my+tv PDF link annotation
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614b2a2bcb348---84215646556.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/xexajava.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/tetixigurudikowadak.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1952706215614b4ace2504c.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/fajemen.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/53645272576.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/56520336280.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/73633431971.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/repilox.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/13562480395.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/5385799277.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/lumujiwetixoxogekifeji.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/taxagogokatexux.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/07e0d9e3d826c27bbdf5e5719c48f9f8/baralapubenovu.pdfIn PDF document text
    • https://tarsiman.ee/files/file/22773810418.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/0dd9516055fe6d92a21779453e20a714/fufewipajozunanuluverot.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///12007077511.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f287f7e796---43186813902.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a6fd2a893---23644352148.pdfIn PDF document text
    • http://xn--90aatbabxd8ae1kf.xn--p1ai/files/37622703671.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/toberisopixerisetaposizev.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/kevinuwolulotipumo.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/tuxebogadija.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/75140964361.pdfIn 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_off0000b0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F4 17728 bytes
SHA-256: 6e9fa789f8ddb57091156385a11b1353c4751204ff788f8e664767c86c119269
font_01_sfnt_off0000de30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE30 10828 bytes
SHA-256: c85f2096cc3d4206a184d2e849f8383bc72f365c5076154184cf0bff5c19d25a
font_02_sfnt_off0000f702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF702 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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