Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4bc7b07bd6b1880…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 02:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 976d6fd9ff376307cb49ad59dd95ccce SHA-1: 21ab5a65543f3c83d6e0de9c871b727e48e03dc9 SHA-256: f4bc7b07bd6b18809c7e580e1329f76f154c6413a437c81cce991624de8c0ab5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple domains, many of which are hosted on disposable infrastructure or compromised CMS uploads, suggesting a phishing or malware distribution attempt. The 'SE_CLICKFIX' heuristic indicates the document likely contains social engineering to trick the user into executing commands, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://pooq-design.com/app/webroot/fckfiles/file/ganuzutinobo.pdf In PDF document text
    • https://highrise.pl/file/97013905256.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f401ff3417---winotesutezudifobivoxi.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aabf99a83eb---musubik.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd337a9ce2---nadugira.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/5e438f15358f5a6e71d15f75dfdb47d2/jaliruvuwumamitumasasime.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/4q71v48fvv2oai4t0hbffif4md/12317473734.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/xibowigubejilijosekezi.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e15948e95e---2239797166.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/b5bf4227f82b145232f0588294f7ddb4/53420412916.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/temixutoxata.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/43090882974.pdfIn PDF document text
    • https://istihdamhaberleri.com/upload/ckfinder/files/37425501078.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f7eccc3c74e3e517a4e39dbb75aa579e/todobalakirof.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/798637129.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/2ujckefrhchpgcg4dbnfoh5enq/98703241226.pdfIn PDF document text
    • http://midel.me/userfiles/file/gamoluwogufudij.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/42669065175.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/5086378290.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/dadoxaku.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/ovds4p029k05i2ekaclm2806hu/1175657870.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/73662430466.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021071911091873499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=boot+process+of+windows+7+step+by+step+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_off0000dfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD6 17200 bytes
SHA-256: a6aea965b63392e82a484480075405112c70ce983f50c020f0baff6e6d740323
font_01_sfnt_off00010c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12469 10848 bytes
SHA-256: a57a322681a099b0dbe1db3ea24f5754aefff0e1671e59cb8ff04697dcdd28b1

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