Malicious PDF — malware analysis report

Static analysis result for SHA-256 30640bb87481d3de…

MALICIOUS

PDF

78.0 KB Created: 2021-09-12 02:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dfe992f4c2df2812776bab37d499cb3b SHA-1: f14c79f0f78a0dee25587d533959b7306e916502 SHA-256: 30640bb87481d3deb8bd75c32ca6f307076150b94cd6b3b6fe15cbe802b25a3c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and a link farm structure strongly supports an attack pattern aimed at redirecting users to malicious content.

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://atputasbaze.lv/images/userfiles/files/96606995588.pdf In PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/53422476969.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/visupewe.pdfIn PDF document text
    • http://trivio.it/userfiles/files/62109581314.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/76750636196.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161316a117b43a---wuwit.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/resubibeno.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/9c287d3fb6716f8656c46d9e1fe27847/52253703041.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/97779777678.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/67510369139.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/zerekupufovozo.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210902015151.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613701d24bd39---70752609225.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/13128174667.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210904022519653.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/resubodoboxos.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/nulazaruvox.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210906_76BCC4936913FA60.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/fazirujunebonatomuwa.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/dagiwefilenewubiwabuj.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/debeduvavojutu.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/57070411264.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/zovaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=zack+snyders+justice+leaguePDF 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_off0000c9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A6 18188 bytes
SHA-256: b4d7ba9c808ddd3f9c61323a45aa994aea6a56a9322df5b3bbc1841e8ad7ed65
font_01_sfnt_off0000f977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF977 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001118e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118E 10824 bytes
SHA-256: 518658700385f7079d0855019ec81aa6047eb85d39f1b88ab48b4e3b29925216

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