Malicious PDF — malware analysis report

Static analysis result for SHA-256 690fc7f126b746cb…

MALICIOUS

PDF

80.6 KB Created: 2021-09-06 23:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3b2a431903094517b5d1adeaa345104c SHA-1: 7fd3098fe9ce63bfe97b1f4ebe507af2809290b0 SHA-256: 690fc7f126b746cb60844367a526c48f333b5659be0a7bee7f93abb50cd91449
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and the overall structure strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://synerhu.ru/uplcv?utm_term=large+numbers+addition+and+subtraction+worksheets PDF link annotation
    • http://d-a-s.cn/userfiles/file/dinoroxuma.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/mixunijeza.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/6455a0e9153c26395a5bec14dbf7ad42/41270344771.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/14163939774.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/pq28jfgl2rvet52142n71b1o27/48152089961.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/12931350022.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210817_CAC2C04E7F8BDFB9.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/rotenazavadigewamodu.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/bitikulov.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/68677891154.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/zisipebugebar.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46524073897.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/tumuxulewefawi.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/fufifupad.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/dazakikozanazesedegori.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202108242305038540.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/zedabagutibuwowu.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/88568879193.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132d065a394e---91043786276.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/mozun.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c93cbf074---31473539630.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/9318c8e526ac0cf26d6cd0fef51eeb82/86738096999.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a02c2512bf3---68465536057.pdfIn PDF document text
    • http://www.ipkameralari24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a424d02e100---naluwixarilajaki.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_off0000d4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E3 11148 bytes
SHA-256: a33989a674812ecc9e9e6dea26dc476d461a3e87996e266c5ea3c68eda425862
font_01_sfnt_off0000ee98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AA 17836 bytes
SHA-256: 0ee0b064a504d2fac3cc61aeca2bb93304556a6656f8d0f57f2f4d4a687ec98c

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