Malicious PDF — malware analysis report

Static analysis result for SHA-256 c343103d90497521…

MALICIOUS

PDF

90.3 KB Created: 2021-06-29 16:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7d089a56aab0836b1a57fe7efecb1b5 SHA-1: e369df77b3bc82ef3cceb6cf449d592815d4cad6 SHA-256: c343103d904975212d1422be0c9b29c23b5280a8e18a90301ac3b8872e049463
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to compromised websites or phishing pages. The presence of multiple links to WordPress upload directories further supports this, as these are often abused for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://irlanc.ru/uplcv?utm_term=find+the+area+and+perimeter+of+an+isosceles+right+angled+triangle
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da100389f5---65798008834.pdf
    • http://artospace.com/pics/file/26112390880.pdf
    • http://bephoangdung.vn/uploads/ckfinder/files/fajulaxafav.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092112f44fb3---74600496757.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160939ed45277a---wamubupilavevujugazet.pdf
    • http://memphiscentral1969.com/clients/865565/File/76554029038.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084ae51ca064---tusarikejo.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/1nrfdtc04v85tdd9c2qhorup67/kasotebipixujixenepu.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/5f5bc6692fdd9d33b54edad9a50e8a4b/70054779555.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dc061bc4b---38506767059.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/8b3398050cfdd29ce56309341664e7de/fuwex.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e83b1d8347---42207456354.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d16b97b0a---61057652592.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/833e09eb7d45e35c9e218f95d1fee192/xupete.pdf
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/mupuzaxidivuzapewineduva.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a516163b9d4---95387190228.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b737e88b931---pifejopakozina.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/d5a098e326ffb6e2da462e245232c216/mimigamijurisafu.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/fehfi37orourh3ou39sdu8epb9/gosap.pdf
    • http://bluekeydigital.com/images/pic/file/9883314742.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d52fc6da16---49178949335.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a48931b884b---90300860974.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5de1057c61---wivemeketoduzelezobineji.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/d4433c2acb1cb61459d663999d95cf23/21656571039.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_off0000f9e1.bin
5e13e2a2e1a137234103c47f3b86f4b095f4272f6c8aad8b0430e27f1bc6aa02
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E1 18264 bytes
font_01_sfnt_off00012a28.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A28 16792 bytes
font_02_sfnt_off0001423f.bin
2d4ca86430ecf7f6bd7ac5d647261c52de838b2350dedfe08e63b3a9767028be
pdf-font-stream PDF embedded font (sfnt) at offset 0x1423F 11044 bytes