Malicious PDF — malware analysis report

Static analysis result for SHA-256 e49c2b26081f6d43…

MALICIOUS

PDF

89.9 KB Created: 2021-07-03 11:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f454ca3720006d5cf5718e070527da3b SHA-1: dfe8acc010a40c341142a2c4143bf5a4d558f223 SHA-256: e49c2b26081f6d434b75eff26656ede8bd0aac30a718bca2fa856b38fdad0fd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/81c9bab7ccc7b193324ed05df29c46f9/70475130464.pdf In PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/giwegeniba.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/b6ee50f8ddae2c149cd3884b649927ce/75879455393.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/e3e583c9d2123b9ca0ab9eb9e80ca309/dizuxefuviputizi.pdfIn PDF document text
    • http://ashioke.com/images/library/File/14544029306.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/ladevapotuvisagitupi.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/o099os29d02gfqnl306uvqofdp/vawodebeluneleni.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/18601617943.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d90eafae939---noparexabepeg.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/16613079125.pdfIn PDF document text
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/50325409312.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/nunene.pdfIn PDF document text
    • http://whewfamily.com/clients/12004/File/sinebepewu.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/vajede.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/pal7touat89sgq29fslodrvuq9/sipejodogopixulamir.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/kafuwubivikap.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/70050376315.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/62266050478.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/muwolugetumegorutaj.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ebff4b97e---37075605732.pdfIn PDF document text
    • https://preciseenergygroup.com/media/56375226852.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/89700667458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=2+pounds+in+gramsPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/220fcaed24d1fa1355239cc6c83191f2/nomepu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE1 17748 bytes
SHA-256: f3b06044bdf7961bb2adda9527835dbcd47c17a309976dc88ea5d85f75ad868f
font_02_sfnt_off00012c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C88 16192 bytes
SHA-256: f7b9253987216832ec511a3c7ffdd777d8ae21bfd21e5a9c2e014f7e310ea55e
font_03_sfnt_off0001423f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1423F 10584 bytes
SHA-256: 6b544919b9cdb0274773171532216f47166a11027c9fc8b51cb6351f60ca183b

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