Malicious PDF — malware analysis report

Static analysis result for SHA-256 aecb8e9a30867276…

MALICIOUS

PDF

87.8 KB Created: 2021-09-01 07:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fa1df9440e4103de5b11b0afba65a27e SHA-1: 47e6370775635d3e5ff88fef58964ac07ca372d6 SHA-256: aecb8e9a3086727680ff00fe8c9c239ed0e3acc3f73ad73957850a35f95e94f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, indicated by the 'SE_INVOICE_LURE' heuristic and numerous embedded URLs pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of external URIs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://pixomot.ru/uplcv?utm_term=compare+two+excel+sheets+using+vlookup PDF link annotation
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609082a03ba00---4682654447.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/foluxuramebikesifuvivun.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/wudazaderagizijumibedifo.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/59705637523.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/31562792859.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e437efea4af0f12b67524bec369fd0f1/54040831698.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/nixosogunibogixaxume.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/83006278801.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/866570921.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/pfs2gblhijjair0nl14oio31od/nafutilatafaladofubenube.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2e44583f6---wararikekatifumuviza.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/8b418c6a8ba30c76e4397f663bf5d5d9/pixusigazixexesub.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/82392404610.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/mubafepogiwarusavi.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210702031840.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/62041814670.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/91780789528.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/bobewijorenelidexiji.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/togojakasug.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/norisogavito.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c0550c6e9---51058335041.pdfIn PDF document text
    • http://socialsipahi.in/assets/ckfinder/core/connector/php/uploads/files/fonarisesipiverafivupi.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a100980e366---24533752505.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_off0000ec62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC62 18788 bytes
SHA-256: 711041dd999a98bfc6938897d9dd069d6b07bf84521e28ac59553f4dbe21abdf
font_01_sfnt_off00011db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB2 11300 bytes
SHA-256: 5a3f815cdd4b1605a2723dd9cb8d4ccea41f2b79a88db40841066dab5a3edda6
font_02_sfnt_off00013833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13833 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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