Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c41d80e0374282a…

MALICIOUS

PDF

71.2 KB Created: 2021-09-15 20:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 00a2bbec0549d5cf8b0383bfaa226cff SHA-1: ea0410e9f2bd060f1335eb23a201fa2ac28f0f20 SHA-256: 0c41d80e0374282aacd8ddc7c5133be7a4774bed48b9f383795c3b2e2464053c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous external URLs, many hosted on disposable domains or compromised CMS upload directories, suggesting an attempt to distribute further malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common technique to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://allytemp.ru/uplcv?utm_term=how+to+mirror+my+phone+to+pc PDF link annotation
    • https://agrimal.pl/userfiles/file/16684041792.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb821b09f9---motibo.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/22970622222.pdfIn PDF document text
    • https://33mobility.net/uploads/files/21874374488.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/guvadotabefotatizotaso.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/luripuxaxo.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/60825357774.pdfIn PDF document text
    • http://pactolous.hu/upload/file/pulilapekutikojarexutaj.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/4424663880.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/javupotuzorafeve.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/57242799024.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/69128628281.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16132e59b9f8c0---30168455531.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/4ccik9cnq007drac3ijvtutfoi/43181887955.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/seliwosorilowumojoge.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/vafakutag.pdfIn PDF document text
    • http://showdoimovel.com/files/files/69019578446.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/ca56f24ae9e69c6e88c7ae21d1540d60/jesetujajumexizosobujale.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/zigifugisufagose.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/kizopepologumox.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/rimufibitufemozipekilef.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/finurugiboruxanugowovuji.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_off0000b3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FF 10452 bytes
SHA-256: 59ff1761c3008114d9a469d1d045506bd7e1d250cbe406dbbd1d5ffa7e88bea9
font_01_sfnt_off0000cb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39D 16656 bytes
SHA-256: 6cdbb0622456a8612ec11899b1de7269fe5c562073a7404fe985f08c4d5d27da

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