Malicious PDF — malware analysis report

Static analysis result for SHA-256 6738ed35bf6cb75d…

MALICIOUS

PDF

85.0 KB Created: 2021-09-17 16:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 986f1e0a72bc0083b01db2845ddeea4c SHA-1: aead816c090dd9943baa478ddf497060fb799fbb SHA-256: 6738ed35bf6cb75d8e57873da5ee1fcd9e58ca2ebed3f5bbfa253c5d56fbd263
164 Risk Score

Malware Insights

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

This PDF sample was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various external URLs, some of which are hosted on compromised WordPress sites, potentially for phishing or malware distribution. The presence of a visual download button further supports a deceptive user interaction pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=lagaan+full+movie+1080p+bluray+download PDF link annotation
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1614062a1cbbb8---89450501717.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/40050749859.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/83298751041.pdfIn PDF document text
    • http://zeci.nl/im/image/zakobusufe.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/181de5cee50103ea731b25890e9a2e2f/27679183967.pdfIn PDF document text
    • http://slsnn.ru/content/files/23229648472.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/sodapowenuzawawegemap.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/kekuzupugigepatosexajir.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/xigasan.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/72016683152.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/ginuf.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417acbdbbdd---vuwufosubob.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/48639249340.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/843a395b6af7c09c364e00014a04f532/82524273831.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/38877426694.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140baadba491---zoledep.pdfIn PDF document text
    • http://juncheng.tw/upload/files/92694320086.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/50650337477.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/9955537478.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/64765461218.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/92780179878.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a141656b84---rawup.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/13981860940.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/sogub.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_off0000e6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D1 11420 bytes
SHA-256: 6594f3fb911dcaf7ac90edfba46d0a59c06209c593b25fbccc17f391d429e3bc
font_01_sfnt_off0001015e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015E 17256 bytes
SHA-256: 7edd18aa589f8170a6ea05d14e687ad2088b9f3162f833e817deb5c0bce6cb22
font_02_sfnt_off00012e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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