Malicious PDF — malware analysis report

Static analysis result for SHA-256 837eee352e9c081d…

MALICIOUS

PDF

129.2 KB Created: 2021-09-02 00:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b6fec4f4d5330ec8fac51e387a0b7ef1 SHA-1: bbedcd32f48f5b5040035bcd28ae6dd64af76004 SHA-256: 837eee352e9c081dab7f5881f1ce43c079bccde59dc71df0b56eec6b092c5779
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://irlanc.ru/uplcv?utm_term=o+god+whose+only+begotten PDF link annotation
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a04f44b43cc---tukipinedogedigunajen.pdfIn PDF document text
    • http://nfc.soo.jp/file/20689033126.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/96092994919.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/786fa61743acc53c2e700f5b5d284802/31945868389.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608307d53b229---67988737855.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/64613ef1fea6868f7b813c22837ddd62/34984699181.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a134a9190f---51580799188.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072c1bd6d56f---8954538238.pdfIn PDF document text
    • https://netlandschool.cl/files/vebuzojubujofituje.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/kexutinizezodos.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/fuzesuvetiwatarafewuviv.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/714cf1d80035ddd83f62494ab1900735/zolonimavid.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/78342948942.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/besez.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/5b4bc1c6b98b512561f9dad2bc6078ac/81533590902.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/96362940552.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/88344326158.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/75768166022.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/2393728228.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c950a4305a---zinuxofivefexozaxadat.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/30570621659.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/dudajaxapupin.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/51676182225.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/rudigofavajas.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c2fa04441---tolidiwedinutowetepigu.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_off00019399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19399 19660 bytes
SHA-256: 13e453a06804618c4b878c544e5cceb790e386884d8f13b80ffbe0859833f31b
font_01_sfnt_off0001c66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C66E 10536 bytes
SHA-256: 996da187fa76cd2e1e460a464eebed449b62288c42f624e16797c37075879ef7
font_02_sfnt_off0001de48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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