Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e42e6203f3cf50…

MALICIOUS

PDF

86.9 KB Created: 2021-07-13 17:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 91d53ba43a6ab42ade4028c96d22443c SHA-1: 0e243d33732bcc719903f22181f1870e2e23207d SHA-256: 75e42e6203f3cf504a6620f42ae964890c3075579f03eab0791da51d7ea286ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or lead users to phishing sites. While no scripts were explicitly extracted, the presence of numerous external URIs and the 'compromised_cms_upload_link_farm' heuristic indicate a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/b4e1d87337b7571624e2efc24e0c2670/vawolofujusimix.pdf In PDF document text
    • https://topinsolventa.ro/userfiles/file/kipifulipanupereze.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/784b655bf5f70233462d4c97f037e0e7/tologadisufefuponirefesij.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/53218218107.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdb42a3fb7---36447054740.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090202b50a23---jefegabaxej.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/fazub.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/92274982174.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/m8ucp0eqq8o32djqo2ik7k0fvm/84125916653.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/u1iu26j7jc072vo5m079thofb8/21222343347.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f45ac8dcb---98538572754.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/00c5c4d69f7baebb98f1ad32e07937b1/3861885204.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/92820478149.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/33116141210.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/99785480313.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/marabofoxovixeves.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/c6c448164ca7920d0c84ee5593336976/rugekidumus.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/lefewudizixiniretopimigu.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6894bf45c---70398992670.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/zebikemuzopi.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a94309057b8---lirujalujumizi.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/14a6cf54b70fa6145506a4a027b6bd88/59552750181.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c313f7cf6e24c60aaf14a789fe6876e9/85487335595.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b8fdbb817---detagaga.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/647954868876c41a5a55245f6a7e677c/69131716360.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+much+sugar+in+a+bottle+of+cabernetPDF 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_off0000eecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E2 11100 bytes
SHA-256: 780c00e9007770091ff8bfe2074668483b1a44b7a20e33a4434b48ff601a18f6
font_02_sfnt_off0001209b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209B 17484 bytes
SHA-256: 74e24110f4c4f2359052a572d8ba42c6e47bf1bfb671dd98fe93579fada41d0c