Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf88959d87a9b681…

MALICIOUS

PDF

89.8 KB Created: 2021-07-30 01:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 88dfc6fd774ea456ebbeb65f060769db SHA-1: 1c7aabf742f93306f46a95a8ee0ecbc6cf923cd6 SHA-256: bf88959d87a9b6817f3e2e7db4518f4b79519a3a8e5fb6846405e1f84023f77f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting domains. This pattern suggests the document is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc7f897e3a---56421901323.pdf In PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/482814036.pdfIn PDF document text
    • http://deauville.ru/files/file/1290611207.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a2a31af69---sanerudebi.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f594a6f856---10765817599.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/wokutusijaxexodisizi.pdfIn PDF document text
    • http://bearcatbb.com/CKEdit/upload/files/nagiv.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/19959593007.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fcaab4a43---45620314002.pdfIn PDF document text
    • http://arslanemlak.com/E/file/46160770788.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/1ul69hpiluipki89nobfp1c8f2/39962756465.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/10698506136.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/42655224789.pdfIn PDF document text
    • http://foodchemsino.com/d/files/wefipamofojigilowirip.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608667fba36ee---31301678833.pdfIn PDF document text
    • https://abeess.com/userfiles/file/98638677253.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/npgd0k8nqlu32sdbls3911vkl0/89213317395.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/lavojija.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915337ed933---nimer.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/33971848158.pdfIn PDF document text
    • https://orrizon.ru/images/file/53089743642.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3786d0cb3---fajunozomifagajaputilag.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160781b43f3d73---vuvujukugi.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/35045954128.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/70752411088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=5+examples+of+simile+figurePDF 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_off0000fc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC02 10740 bytes
SHA-256: a459f4fdf879e78d99739bdf8f79b022a5f66a1776f89dfcf8bf80f89be30111
font_01_sfnt_off000114b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B3 16920 bytes
SHA-256: 022ed0cebd265fdca18f455f2e1dfda3fde7db1bc05b74353b60b53c7e684c15
font_02_sfnt_off00014083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14083 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1