Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3f655e1a8e6b0c…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 06:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 65b16bdb1dc4ecc930b6668e902c2d20 SHA-1: 3694fc0ba71b72a99ba6dbd4b0ce147d21482afc SHA-256: cd3f655e1a8e6b0c53ed8c02b72616c2e1cc2f56538b45a75eb0f5e9399e9151
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains a link farm pointing to various websites, some of which appear to be compromised CMS uploads, suggesting an attempt to distribute further malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://thekreativecompany.com/uploaded_files/userfiles/files/zomekoduzenizenif.pdf In PDF document text
    • http://atthaya.com/file_media/file_image/file/borididuxasivete.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/64105867898.pdfIn PDF document text
    • http://446888.top/userfiles/file/83779124561.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/15605079469.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeec59d238---26912979766.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/gawep.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/2bffave61p68eptkltskhftd5n/kapezakubi.pdfIn PDF document text
    • https://giustofiori.it/file/wenejokupu.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/xavilirawovugobi.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/42978617175.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/nekalatiwerubitigoga.pdfIn PDF document text
    • http://ashioke.com/images/library/File/73556791017.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609900edd102e---6859486328.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210809_190542.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/10e99b9fe73a8837d249dcd92db2e209/gezoxotidivenewaf.pdfIn PDF document text
    • http://jp-cable.com/d/files/3289239243.pdfIn PDF document text
    • https://synersys.fr/contenu/file/11642053608.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/nogizivokod.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/d6ea33a73b693be6526a13f9817b42ae/gubosigakodadan.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/fudowedoresipatuge.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085e469e9f76---vigojagimamuzuwixu.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/d1e7784582f3f98e7c7a6ca992ecc716/vujitosivekujuse.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/72af6f757db68a638f543f2d8498cdeb/sunasugogexirigevowuk.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/2a13c9b372363d82dd9ed5dfa461a93a/72759468150.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/welofufowodet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=pmd+to+pdf+converter+download+for+pcPDF 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_off0000d144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95B 10672 bytes
SHA-256: fee3e45c6dcb28444f76e2b12e4a18c0b3d11f0f270dcdcd51e84b0bba5970cc
font_02_sfnt_off000101dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DC 21668 bytes
SHA-256: f5982a829bcc9bcd63af6203d6875ef28dfcb2176347b204b4d9367ed0f44fda

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