Malicious PDF — malware analysis report

Static analysis result for SHA-256 09236eccedcac881…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 02:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: e73a9a095003aa0fd5c42651151a07e3 SHA-1: 9a4c7a77fc883976932f3d47aa77389b13f821cf SHA-256: 09236eccedcac8817505ac40936ce4ee4d434b4d2475db7eaf18ef3bc506f4d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bomando.bomsolar.com/uploadfiles/files/55194482857.pdf In PDF document text
    • http://camionespanamericana.com/userfiles/file/nonapovozasi.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/46040762369.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/sfsn8tcttnms67peqh3k4f73s0/34042858023.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/31059710451.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/solosizotozeporojifovaj.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210609_064359.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/ae7f277a9310bd6137919e27efad6c1e/14510614080.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210517085744.pdfIn PDF document text
    • http://www.ximangsongthao.com/app/webroot/uploads/files/11744525589.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/2411029438.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/xuziwijarajawavavifi.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/muwidutilokud.pdfIn PDF document text
    • http://myqself.com/upload/files/1981350043.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/fe23dfebaa809ca1385251919cffd815/rulitiwav.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/xokafagu.pdfIn PDF document text
    • https://avflash.nl/upload/files/maponivutoposatetuzatugo.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a854a2107a---44186504749.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/63455076630.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/potavikad.pdfIn PDF document text
    • https://ilcaminodaugo.it/file/39706610488.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/b77ehrg7vnt652m8kpplmhnmr6/37127502619.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/xenalis.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/37002005812.pdfIn PDF document text
    • https://promise-land.com/upload/file/sotibub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=exercice+conjugaison+anglais+present+simple+pdfPDF 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_off0000db46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB46 18152 bytes
SHA-256: 21643a1ad5e723c03c04d0320c21b9dd0d68df0d5aeb1aa8f20e5cff58eaa3b3
font_01_sfnt_off00010a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4C 11276 bytes
SHA-256: a251e97a9d5d3508f4d8561bdb5bb1c132bb8f1e32d32126b8f2261b53575385
font_02_sfnt_off0001248b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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