Malicious PDF — malware analysis report

Static analysis result for SHA-256 480eef8cb1a710b7…

MALICIOUS

PDF

85.5 KB Created: 2021-09-09 07:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c339274041dad262a4f0c060eed77517 SHA-1: f3bc746b560a44c5fc1ab28c87c1301e57707fa1 SHA-256: 480eef8cb1a710b774ffff11cf5702d046ba3a23a3883241722f3b6678d32412
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The embedded URLs are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://axi-hohenstein.de/userfiles/file/wiwizibamemotepuxoten.pdf In PDF document text
    • http://varosom.hu/userfiles/files/wavuxitodivedoj.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/c37115fc41a6b0a609eca4d2c0730e8e/wamomawojawip.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/kosebe.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161360a3151251---fominugivupuvimug.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/vubito.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c845bd6c1---sumalopobomakoligunif.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/lojini.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/cn4rk3bfn5s2k8hq13cgnc3d36/xofof.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/nosasorejupijirutebetaze.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210903031931.pdfIn PDF document text
    • http://skolky.info/foto/images/file/33470556665.pdfIn PDF document text
    • http://muszempilla.com/files/file/49194178918.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/32967315485.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/labigisuxivazexu.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/99041903258.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/wefigadifoludos.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16133626a30a1d---vejutipanobil.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/89137176094.pdfIn PDF document text
    • http://grandfiltr.com/files/file/vabuzaserin.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/neberakekaluwokupiwa.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/memevofipokomabinezaso.pdfIn PDF document text
    • http://candientushinko.com/images/file/mutimebuzuvavi.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/320c30d02d3220488368c2f1761fb5b2/podaji.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/gumemeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+lock+your+phone+from+another+devicePDF 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_off0000e7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D9 18024 bytes
SHA-256: 872fb33f00114a8320c79c43e8aa4e32c753535afe6f5aff82b48aad68e03337
font_01_sfnt_off0001164b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E62 11168 bytes
SHA-256: ebb1e8b2e4b70fc5326d0e0bb02db376d782acfefa2798cb999d6ba918bf8164

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