Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbcfa8b79468b5f5…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 02:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 03c82e1280bb2726518810950d9a707e SHA-1: 124007106bebe6198c85d997ba8ad79dcff763df SHA-256: fbcfa8b79468b5f5b2a72fd3f6de02215462fa1eb06f9831212b3e78fa1ffa98
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure suggests potential exploitation or redirection mechanisms typical of PDF-based attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://stalbeckers.nl/userfiles/image/file/nuseluzosobavijunojiku.pdf In PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/54984865385.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/nevinek.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/sobupasiro.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/50721198822.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/21324204874.pdfIn PDF document text
    • http://cichanski.com/Upload/file/rejiwuduvileworad.pdfIn PDF document text
    • https://davaocarrental.com/images/file/koviwikudanorudut.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/46240207235.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143508948161---fisupikaruvajoxuravajoz.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/gifijasilodab.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/puluwojajamasevokojajaj.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/77703370513.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/30655854526.pdfIn PDF document text
    • http://4rrecycle.com/files/file/40281948653.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/pufonubigeziveko.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/jotudi.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/uemddigc63a0969t1e4ibn65de/kiwajeborizojanotuxeje.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/sowuwudiwekanolemopuvix.pdfIn PDF document text
    • http://kccmaul.com/files/files/deletiluwitapi.pdfIn PDF document text
    • https://bdata.vn/upload/files/zatubosazabijorut.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/mologor.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/63c10f1ac2caeb89c7f788df687b316c/74363548506.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/serutizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+use+a+mouse+on+androidPDF 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_off0000d490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD490 10540 bytes
SHA-256: b1a11b322760133041035ae14bcea4a8fb7f91e0f1172baafc15e4ceb03c23de
font_01_sfnt_off0000ec91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC91 18396 bytes
SHA-256: 430102d77cbe1bde1d01c84bacd0eb3fb746d7a387caccb6cec14f28a5f80719
font_02_sfnt_off00011c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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