Malicious PDF — malware analysis report

Static analysis result for SHA-256 3151f3b70c418ec3…

MALICIOUS

PDF

85.4 KB Created: 2021-09-03 01:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f5210ee3a4f3fdd0976c857b189c6c9f SHA-1: 090b7697b6a722146dbabe052835e0e4c515a7f3 SHA-256: 3151f3b70c418ec3976bcbc986344fb2c4defb89add5fe11243d778e9433dec5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous compromised WordPress upload sites and disposable hosting domains. The embedded URLs, such as https://laborke.ru/uplcv?utm_term=home+run+inn+menu+pdf, are likely used to host malicious content or facilitate phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://laborke.ru/uplcv?utm_term=home+run+inn+menu+pdf PDF link annotation
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89cc75bdcb---39330548249.pdfIn PDF document text
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/11f53bccef7c16a9964cfa8443c5aa05/fedab.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/e13c065de857fc87f086c180ce6cc4da/69651275930.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/27740932984.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f765091f3a9---xemanepezivojugirunamokab.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/zevanonajudu.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/en7eddgtqc0iesb0tk4u53i8s1/repogegiwetutetopok.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents//files/45833226980.pdfIn PDF document text
    • http://toonesk.com/upload/15190312560.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/6u41lkmd6j3pll7co7cvgu2b76/temozosuverawixenumonu.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/mefitogurigowudekel.pdfIn PDF document text
    • http://dentherapia.hu/files/file/35509317875.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11bb254fe7---fobefegasediz.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/vafebexatob.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3279753acb---kifijupaki.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/sakibepekobegegiza.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/nepobagijidisalaf.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/0a41d894edc0a4cce39b3c07a7f04b7d/51428978432.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210623/file/16244449936901.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/93198703321.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/c7719715bb54b42f35bb381c207b7db6/polukaw.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/vuzexajupore.pdfIn PDF document text
    • 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_off0000e5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EE 10276 bytes
SHA-256: 4630519b6ff1e4d727801edb2b7d8760da6cbeb1d5459af3ac5c2341790c6bdf
font_01_sfnt_off0000fcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDC 19776 bytes
SHA-256: 2d5c8039ff638b55604d5857c8b174859e315b18bc70c89d6a8a73b3aecff393
font_02_sfnt_off000130a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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