Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1037ff6c24ffebb…

MALICIOUS

PDF

85.5 KB Created: 2021-07-01 13:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00d984abb4ccc1fe6f691933626512bd SHA-1: 179d6f0fb32c43696d84b6d02a9df5cb2484bc0d SHA-256: a1037ff6c24ffebb3be1ae29ef43b18067d4678101817859da30b3b9fcbffd67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests the PDF is designed to redirect users through a series of links, potentially to a malicious landing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=strategic+management+awareness+and+change+9th+edition+pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/b28jia7mu9upte6u5u09vqf251/32438633804.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a625e056f0---28470280018.pdf
    • https://penzionradvanice.cz/res/file/65921755103.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/b678780cb171d8343ad6da6e823aff41/fupowi.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/5iepjdtno0hk5mvbq63emci6m3/tepomirurumulilokazoge.pdf
    • http://pokemom2.com/uploads/files/9037497177.pdf
    • http://agataklimowska.pl/userfiles/file/kiwazamoxu.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e254390d9f---vejepezinusabegupizib.pdf
    • http://baaningdoi.com/file_media/file_image/file/28647388424.pdf
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/wokelelinaxisunefil.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096706151fd2---32457892764.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080490a4da1b---xusivowomuziwekam.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16080ac5185c39---tebivubotagudifumeza.pdf
    • https://artasedanasingaraja.com/uploadfck/file/48388721601.pdf
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/jivonopamadaremozujifok.pdf
    • https://abe-rdc.com/userfiles/file/budalan.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/sqkv5dl69gvu1mc6vnmupq4s9l/wobakizuvawabemolabetopu.pdf
    • http://rollfactorytogo.com/uploads/files/11143465440.pdf
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/58530694447.pdf
    • http://chinasoftcore.com/userfiles/file///bivoluxabirif.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de3119a715---40390141810.pdf
    • http://inwallendorf.de/userfiles/file/jupinovuruxireto.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160725ef207dbe---rosiwenirenunesur.pdf
    • http://dalnoboy.net/data/filestorage/upload/files/lawenamax.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f97e191a---gitofugiwifufanefesozat.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e66c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE66C 16792 bytes
font_01_sfnt_off0000fe7e.bin
027263b134d134cac8d24a1afae70d3cf40ddb0cbb9d70d5536e801f59446427
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7E 18808 bytes
font_02_sfnt_off00012e0c.bin
0303475ba4cc912e19a714445cca9250208333adb1ed76a5728498c8c6e4f5f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0C 11352 bytes