Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a55ef9b4e8fc97…

MALICIOUS

PDF

104.9 KB Created: 2021-09-05 04:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1401075cbe9ea29598d9742b5667314e SHA-1: ce373e4223fd6f6d677c19d68ee609ac182543af SHA-256: 74a55ef9b4e8fc972913210cf8a5a6440a5f98ae64228688e05bbff3d72942d6
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to websites that appear to be part of a link farm or hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, so the primary attack vector appears to be social engineering via link redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://packamate.com/userfiles/radagiruzudeboxo.pdf In PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb206a488e---mezikukitak.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/guzal.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d85d2624b2---74904291869.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f28732c6758---92664449044.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082d3f483b18---81031674270.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161012893b3e2d---91084223717.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/zirotejuludevan.pdfIn PDF document text
    • http://keramann.ru/uploads/files/papurawiloxuvosuripiru.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/17332310116.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72576604638.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/xeragidamutewiwepelebifor.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a878401e170---tudesuzewakajibu.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/tolemixedizusedobi.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/botuwes.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/farinafuzulapiwagazesajap.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/8655bd540aa9fb475b55a253c59f1052/9992697760.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/0b22a7fb2add66e1778ff6ef2f1f857b/64612249699.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f90465ab222e73ce695dc8fc4ccc07db/rokewodiwilut.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/gugevasasuze.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbce7ce0b7---61131572397.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/9914487425.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b63fc154533---mudiguwiwapaxumamisema.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/afbaf453ad6702daac293e4a5b116538/10306908521.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/qtrkelpsvm3u2u5c601e8k0sk1/bewimik.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bcc5c64395d---24643654266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=mechanical+properties+of+ceramics+wachtman+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_off00013055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13055 19708 bytes
SHA-256: d6a25fc6e488dee31e3bfd98ac17e008f3956a4c81d72b90825040855639ef2f
font_01_sfnt_off000163b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163B1 10964 bytes
SHA-256: 3b578ffc9182c33320a44795e4cb2338bedd75a0e9714cd8d8dc86690d3e5dbc
font_02_sfnt_off00017cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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