Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a888f3ce29bfcf5…

MALICIOUS

PDF

84.5 KB Created: 2021-06-28 02:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a9758a3bee13fedbd20fc1094fc740de SHA-1: 4a424fcbacef4f7ed851c747a2d31e8676fc8e33 SHA-256: 7a888f3ce29bfcf558c976d201cfa2483f6857122b7618990a8447d034e04798
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of numerous URLs on compromised domains points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9afd4a8f9b---fewetoxevufarumifawe.pdf In PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/33577278759.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a7b75436ab52ad6c5d08f59256ee01a6/fikirixozugasovijemenewe.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/pivijeki.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098297910409---wonavidumekuxejepatejej.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/6177d1e160e52f135f1a876d4a4cb5bc/watavuguvitowofavidup.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/93ae705706a30060a186090ab2ad5871/joxubusosirulimolipa.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/81035792473.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d5a73c79bed34a7939a05360ac6f1259/fofefanutebejogav.pdfIn PDF document text
    • https://yalcinplayer.com/calisma2/files/uploads/zivinojilu.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/244ea8d36d6eae48f6fdd3d85db3a178/9920105934.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d7d9f06db---xutefozifigaval.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/zefadejivejaxejovibewedi.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/3f425c193839a7fa7b167869c954c7d4/33777273714.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082316451e45---4790191184.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160899f19add03---biwinolonobativex.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/sch7g6i5824ose5qufo10emofvh3i9sa/11204714275.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/a514923fa4dd158f1412b11bcaa3437c/nevevovoxemi.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/a5g2ls7oi6usc9au2fqvcl5uth/62922379481.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/njndisnt94sgb4sdeg2dju0nv1/93121345952.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768317d15f0---sesikukidabukojusilupusak.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/mafefiwukirufegunovu.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0afabba76b---95872376692.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/50462030751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=barriers+of+communication+ppt+downloadPDF 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_off0000e4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E8 11020 bytes
SHA-256: 36da92bb229fbc31b5047e12c002b02e033d2b93659aeb66d1d17c86d5a28e1e
font_01_sfnt_off0000fe9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9C 17756 bytes
SHA-256: 34f7b7e1f02e274d612e9c76396fd20b858f7d2cbae8b8f812e6c88e4c179025
font_02_sfnt_off00012ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1