Malicious PDF — malware analysis report

Static analysis result for SHA-256 b382355048b25a5f…

MALICIOUS

PDF

81.5 KB Created: 2021-09-05 07:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d1f6c5b919d9489da0c6b594ae8acf20 SHA-1: 3e7f47dfa0b88fb68edec23ea8e647c8170511e7 SHA-256: b382355048b25a5ffa5e1db1fbb7f1605c31afa7ac9cbdb8eef3187899e8770b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm strategy. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO poisoning to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://vieiras.pt/imagensprodutos/file/75740698162.pdf In PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/fogaranutawijorugumalik.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/fetojewepetozal.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/m6nh5e9baghhkifrjh2vr84bh7/21316709874.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/mexadosexa.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608416dfa9236---xureli.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/18883114701.pdfIn PDF document text
    • https://cakkue.com/contents/files/miwidet.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/vigasokukolusirodo.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edee1b24020---buvobusifesuvu.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/zixedi.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8024a44e24---zuzafomugoxinefozoj.pdfIn PDF document text
    • https://shiokerbau1.com/contents//files/54366496070.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/73480872748.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ji5cqo91ba50f59jcgeggqkdt2/94563189271.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/mobukepolanafatexuga.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/fenezasufenalumunotixo.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fad081199c6---roburigulofupugad.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114b2dbdc347---belomit.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bff493ccaf0---nejod.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/jisakekozawikob.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/jatimulimux.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/as95s501f0t296q165t6buelr8/15547973060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=dobladora+de+lamina+manual+monterreyPDF 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_off0000d5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A6 20072 bytes
SHA-256: c023fc228e70436f839d0fea2927ca52e4a2a060d80f8e0bf860bdf49b1368aa
font_01_sfnt_off00010800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10800 10596 bytes
SHA-256: 4164e25e7b65f16107035aab2c6a590d15aa8b460afcb1c1a611aba4f153576c
font_02_sfnt_off00012026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12026 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1