Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e3709b8b804e62…

MALICIOUS

PDF

98.1 KB Created: 2021-09-07 14:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 29bdc70ccd4b51fdeeb1512333a437d4 SHA-1: 05af91d9dc83d99075613c244d98a2a623d44b71 SHA-256: a5e3709b8b804e62579579819a816d47f5d7a2b1a45195ca6fe0a19c048d169e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the PDF is part of a link farm designed to attract traffic. No scripts were extracted, but the extensive use of external URLs implies a redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=b+braun+perfusor+compact+pdf PDF link annotation
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/79952008708.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5626f1557---93215017471.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/9612984603.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/1212910468.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-8-5/20210805181931526031.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fe10ae05---64165664224.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160748142113fe---jofebokesavofabaku.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2c63a7dc2---butalameg.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/b2d0d2eccea3df48d6c2e276b140a51d/3095388385.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/6cp51j7i1fa6mv311ebp3fll64/vezinokukezomil.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/56022081287.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/0cb9b4f4a7a76354614caf1a1c5d99a4/7679733032.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/0163696f359cdb0085591a594e7af406/zogumolalojosulukofujavi.pdfIn PDF document text
    • http://cl-pub.com/files/files/joxenisigozawudosib.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/59499414433.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/21708180133.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/17954656069.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/kelenimanugugododajogaz.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e982ff53e56---22319007211.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/99155953277.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/74363190976.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210717230727524.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_off00011a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001327b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327B 10936 bytes
SHA-256: 7cd657ac614113067ff257ed50bbc225c57aa6f53e0b833223cd905786f227e9
font_02_sfnt_off00014baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BAA 18152 bytes
SHA-256: c3d561558dc146885bbc56a71c3c9a4e1b20a4ad10d18fe5da3e1137656d4558

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