Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a0b209be70fbba…

MALICIOUS

PDF

84.0 KB Created: 2021-09-13 04:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc80e488aa7bc39531922edc536f38e6 SHA-1: 24711cb22893fdab263506dd02f71970467cdeee SHA-256: a1a0b209be70fbbae3af4bcbaecabf408dd7f919fab4fa16950ddd7f59cc3fa7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable domains. The presence of these links suggests an intent to redirect users to malicious sites for phishing or malware delivery.

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://cructi.ru/uplcv?utm_term=comics+bob+apk+download
    • https://masihpt1.com/contents/files/metoresupotopom.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399abb57301---84475584125.pdf
    • https://tezerwatch.com/file/upload/files/09-06-07-59-40-42.pdf
    • http://hotelgiottotorino.com/userfiles/files/mudenupedifebirevururabu.pdf
    • http://mueblesdepladur.es/1/userfiles/file/40225923401.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/a6b5672af6fc1cd372f79bca1ab5caa1/masuzobavoruluf.pdf
    • http://myucmas.com/userfiles/file/13817807700.pdf
    • http://karat-dobremiasto.pl/userfiles/file/52219172839.pdf
    • http://popnmusic.fr/userfiles/file/pevusunubugotobavagig.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e297bbd33---ligarorurupupegolofajopog.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/e8j2to28uuu6p8b75itj6urcgq/58969227737.pdf
    • http://cyclad.org/UserFiles/file/97765969212.pdf
    • https://www.domosystem.gr/ckfinder/userfiles/files/basiduwalakogujasugozum.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/392ff56aa86d5b5a0a55ba9d02108d87/37188329067.pdf
    • http://studiodabo.eu/userfiles/files/92096186984.pdf
    • https://yoimart.com/upload/file/20210909052353.pdf
    • http://synergienetwork.net/userfiles/file/80236646589.pdf
    • http://ecovn.vn/uploads/news_file/pabidetuxe.pdf
    • http://marklaliberte.com/fckupload/file/modenamoluwamilidug.pdf
    • http://cissi.it/userfiles/files/81392495977.pdf
    • https://openkomm.yussfone-crm.com/userfiles/file/goritapojugojofo.pdf
    • http://orvosvalaszto.hu/uploads/files/retowuvujekikukaxaleb.pdf
    • http://ulv-fogger.ru/d/files/36983333078.pdf
    • https://galedo.cz/www/data/cms_files/files/91231486682.pdf
    • https://smsenerji.com/resimler/files/visize.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_off0000e6e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E3 16792 bytes
font_01_sfnt_off0000fefa.bin
3e109d494f0f42b2c79d2cfc38c489408d6e8452fc6ffc4ae21a19fe25e03a8a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFA 10696 bytes
font_02_sfnt_off0001174f.bin
78217e89d7ba4fbfe7718d2ebd0e9eb265fb202dfed7be07f2a2c7be99cc6d10
pdf-font-stream PDF embedded font (sfnt) at offset 0x1174F 16692 bytes