Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb8e1cb02c308b8…

MALICIOUS

PDF

85.3 KB Created: 2021-09-07 08:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a5e644df2268c9925c5c9ab61192aa4a SHA-1: 9b433c495289963fddd4c6e005857c04ec600612 SHA-256: 2cb8e1cb02c308b8b6e795fb05c0bbcf8456038db91831198e6847a52c1f1cfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with ClamAV detection as Pdf.Phishing.Trojan, strongly suggests malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the phishing detection point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://leprofit.ee/cmsfile/contentfiles/8132914336.pdf In PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e73543309---vagesedileninu.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/1e8a29295883911c7c3338e264d29818/paxujotoregipo.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/45462996125.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/30a402638c2a453e9aa2ceb59acd05ec/nurupexuted.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/78007008382.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/3940791303.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/97297162423.pdfIn PDF document text
    • http://yuha.be/_files/file/73430848003.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b95a30cb57---49484902853.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be2def896ae---ramazopegulen.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/taxazanepigovajimaripog.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/72994413925.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/36769659585.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/40769583639.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/36ae53101abd66db2743410330354c8a/sogeluxiwolo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbd4f143d8---51804594333.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/44679471177.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109f37e35471---24560420834.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16087aaec746ca---26984145869.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/razedujux.pdfIn PDF document text
    • https://edinburghpools.com/contents//files/40078187952.pdfIn PDF document text
    • https://noddy.nu/images/file/ripivivifarub.pdfIn PDF document text
    • http://thehigh86.com/clients/13680/File/72592028166.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bfb214893---50005317646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=fsh+and+lh+hormone+pdfPDF 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_off0000e65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65C 18868 bytes
SHA-256: 2b255fb7c1ee410a8f0dc70a49ca6f1354508dea6515135122cea48f207bdcd8
font_01_sfnt_off00011770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11770 10548 bytes
SHA-256: 8e336996ac44a7232c771b3ffb330faba6da76af05f1f45a1cdf0636b53ea455
font_02_sfnt_off00012f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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