Malicious PDF — malware analysis report

Static analysis result for SHA-256 be9b8907d35a31df…

MALICIOUS

PDF

88.9 KB Created: 2021-07-02 13:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 51375c6158c5c2f45446f5fb4bdac894 SHA-1: 9aac91e4cf1f05197301d77b522f043f0427de32 SHA-256: be9b8907d35a31dfa268042748293cbb79ccc7f64667779895a482521da8930b
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 WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs are likely used to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://snypes.nl/img/customer//files/somifowanulev.pdf In PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16097d10336f9a---gekebuluna.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/i7i5hngk1a01no82vjh1r1c461/zinakiluf.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1f10a60eb---nadikanilixevesevelesen.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f72877b9a---68232208011.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c770895f32---92476414210.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/20303f57a550f549078073d27e941a73/fenakaximuwafodot.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/pisujolojesarero.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/aa7a4253126f944fbafac1abebb91808/73697211158.pdfIn PDF document text
    • http://ihvanturizm.com/rsm/files/84152639315.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/sr04u5053o44ketd4g37a60ng6/76321447049.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/som2ncdimj34enkq329ssggio6/75302974657.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210621141435_u92m2g.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/dimuzepave.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/68c0a321a0c5dbf1c3e1c141fb14e12a/lelek.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbaa0c76326---buxagupiki.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/b1a1293fe216c75e287332484b045661/91533845729.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/rirone.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/4pft2uepr382o7crv8tjjrmns3/73851132415.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af5c4d7e7b8---15295701240.pdfIn PDF document text
    • http://rld-carbon.ru/file/8486950531.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/65810555828.pdfIn PDF document text
    • http://arslanemlak.come/file/12557463856.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088dfa28fd0b---4707196203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=chicago+cite+online+articlePDF 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_off0000fa4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4C 10372 bytes
SHA-256: 34269ef4e4e9bbeab09aab0b3056265f4f455e8cda61728402c6256ec57b25c3
font_01_sfnt_off000111b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CB 17176 bytes
SHA-256: 41e7ea0060d5d7121835563e9207279b53c78fd9ffacfa7332a2850255e7e276

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