Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f14942ee6f4dd0e…

MALICIOUS

PDF

110.1 KB Created: 2021-07-08 09:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bae668d6938121750c84cc6f009ec4db SHA-1: 8a49683058f18807991422647585036701187400 SHA-256: 1f14942ee6f4dd0ed0917b05e83a40f1defca597c259e85bab85699760e308cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests the PDF itself is designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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 http://csc-020.com/userfiles/file/20210708050049_o5pcv6.pdf In PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/1995fe0cbe19c7525170ab04a017404e/86760504847.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/4294883375.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/a8ccfac884ecc79291565118df7ae216/wogam.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/qmh2ogts0tru9mcj39vti906ml/6612258899.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19d32639e9---23322465206.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/nesusekez.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d65885f3a9---56564585684.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ca09798c1---68570363964.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/ca59e9a114d438284c2bb5360ccbe62f/nozagiwowira.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d83e0ee175---40849400369.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/76661994801.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/add32f07b910f3af7f3865f0368c6900/20330536569.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/kewaf.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/168db4814574ddee7bf84d46ef69c8a4/xasasipujixo.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/55733686709.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/e1826effb4ac9724642ac785ee95e2fc/zaxusuwumavofolokotafoj.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/5uepmc9dn0qc3a7hk7ueq22ks6/dexapeketazubenejojige.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/67211201040.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/31629827626.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/zelin.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/rijoxonijudasixutur.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/474fd2d2fae8da961c343f083fbfc2bb/gusimanufepixuri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=another+word+for+nevermindPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013331.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13331 19184 bytes
SHA-256: be33b4711eb77fe90436b593b6d4a3c051efe8fb4d4cec45df59705be178053b
font_00_sfnt_off00010e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E70 10376 bytes
SHA-256: 27a54f026ef7b8225c1f89093cd852b696c7926061e49a4f42af143dcaaf5b44
font_01_sfnt_off000125b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B7 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_03_sfnt_off0001538e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1538E 25136 bytes
SHA-256: 579401f893a2daf8e4434e8414668c084e7b13384815db2da1763d98004e5903
font_04_sfnt_off00019270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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