Malicious PDF — malware analysis report

Static analysis result for SHA-256 682e5d8a2eab70a1…

MALICIOUS

PDF

86.1 KB Created: 2021-09-09 16:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8aa3bcb8980695edaf6faa6dbd1f0981 SHA-1: a0dc0c753fadc2269323647396a674d7202e03c2 SHA-256: 682e5d8a2eab70a15ebe9b31176c1e0f11ee44137be319623019bcfd07c32d80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are structured as link farms, suggesting a phishing or SEO manipulation scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=best+cam+app+android PDF link annotation
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/tifadalifiditaf.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/woropilodupanuxi.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/45752065977.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/jikubetej.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/wunuzipukoken.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/5dbeae9617f1949c66f78b5e078bdae6/felozapogijexunifobexaken.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/duzolamaraseworimobobiwuf.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/nakevim.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210908124718804.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/bugotopaxigufabesofovexox.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/61337182800.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/19523622089.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/n3mchboeu8f70rg3urjfgdltb7/16952768361.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/ditavudeto.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/kizokakowizal.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/44052779550.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/64849089448.pdfIn PDF document text
    • http://gr-chem.com/upload/files/40790861266.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/87673050145.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355151dc8e4---85730890333.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/78326375286.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/32772129569.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/bofafuturugolasopun.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/wijisug.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_off0000edd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD1 10680 bytes
SHA-256: 2f3c68363d179270c81adaefb43032c66160c39814850040b4f57f11f06c8f98
font_01_sfnt_off00010651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10651 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E63 17180 bytes
SHA-256: 54d37100f4d41c3101ff707849785dca50a9f4f3a0d5a836eaa8e0767bb92b35

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