Malicious PDF — malware analysis report

Static analysis result for SHA-256 5400f34a1d385924…

MALICIOUS

PDF

85.1 KB Created: 2021-07-03 03:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9712d44c7bb90c4d30296e2d20ab801c SHA-1: 9587b34d92bda51dca30ccc5f6b1bbc3ecba5cd1 SHA-256: 5400f34a1d3859247441dc9ecbbbb2ecfd08222a0ab7394aa8ba8fe59f49a733
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on compromised WordPress sites, with numerous distinct hosts and URLs pointing to PDF files. These URLs likely serve as lures for phishing attacks or to distribute further malware.

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://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989fa5d7619---gesezajefowedononebenimo.pdf In PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4a6e182fb---46478668813.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/47497799589.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/032050575838.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f09846ad52---sutonomiwipage.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/tokezirami.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/e8183e40eb75ffde73f85944a9a7d818/sokeze.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/62f1thhabg0at477ut8ke939o7/94815761996.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/lirebileguvifil.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16087ba745cd12---19947913217.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b4220d0a---najefudobizo.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/93613706071.pdfIn PDF document text
    • http://vejwun.cz/images/53522758407.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/47568fc3f93df9dd09306a3e1e107586/ligawapekine.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d7bb8231b---zabapemizimetuwolili.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dbad8832569---80156687761.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/bulumitisumozanob.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/e3c902dc5f4c84114ef1af7f7934caac/47953063463.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b9be65602---27819884321.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd8040f180---31126189566.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083118b1a532---malukapupavivuzez.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/95636959659.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/66c475816ee02d9d1d5d31853f46c0d7/325601420.pdfIn PDF document text
    • http://tecumseh1962.com/clients/85183/File/demebutagijufodev.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ba7dbca0f---97396655769.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=alcohol+and+visionPDF 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_off0000ed25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED25 10184 bytes
SHA-256: aba53021bfeb7461749bc714a08cb72d59ce7cc5c98d226e2415d9dbeea6258e
font_01_sfnt_off000103db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 16740 bytes
SHA-256: 6a3dca9741abae726661ddd353372b8916cedcd83c07f0ca96bfeb0596566680
font_02_sfnt_off00012f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1