Malicious PDF — malware analysis report

Static analysis result for SHA-256 f483d69b78da356e…

MALICIOUS

PDF

76.3 KB Created: 2021-09-05 12:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0a3c1c1f8c778e9ce93302aa3da78257 SHA-1: cd64af3e670442ffd4063743831a74e9dbbbdfb2 SHA-256: f483d69b78da356e6d5cb017243b698c90220564462abe5d6c2797c142d2f1bf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to other PDFs hosted on compromised WordPress sites, suggesting a link farm designed to obscure the ultimate destination. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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 https://catamma.ru/uplcv?utm_term=melsoft+gt+works3+manual PDF link annotation
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a07b99a77c0---dimafupasuvaxasoginapad.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/e0668dffbc571ccf28af34461810c297/watatojo.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df80d4659a7---xolinepadudatijagif.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/77662523470.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c04074534f5---44302596436.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/nemusuwipesadunarivur.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/4603279682.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/77292186637.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/berugiwipefegitomofix.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e5a8a8d905---16264708057.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210827073106681.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/26824648572.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/cd17bb694b72682eeb38040d2d489c10/38637258352.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/18116968198.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/xuwufowiremefusen.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202107file/2021071810231570554.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/gefab.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/10755844491.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/55c1f05a913d2415f6563d24eb2f047e/sobipawanufivivonameje.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16105423c7e999---66210055303.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/83431553278.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/zalezibuwisinuze.pdfIn PDF document text
    • http://poiskvod.ru/images/file/tonuseleroxomebikaxalinur.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_off0000c277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC277 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8E 10908 bytes
SHA-256: 5f10fd3dc34bf55e4b243601abe0b6ce9333772d014b3fd78fe601e4e65d83d9
font_02_sfnt_off0000f402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 17992 bytes
SHA-256: f8acad52a45a2666e20db4c53347a0b3076e5fd6c271e1d7c5ae11ab6d31f38a

Open this report in the interactive analyzer, or submit your own file for analysis.