Malicious PDF — malware analysis report

Static analysis result for SHA-256 edd9e34da7606f65…

MALICIOUS

PDF

72.1 KB Created: 2021-09-30 11:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 38f1601274b2af253663e886dd245d00 SHA-1: d9022370649d1835a31bac84f75e15c05ea08abb SHA-256: edd9e34da7606f65c73c66a6e475da0245a103efbfeb276227c9cf2a56218633
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. The presence of external URIs and link farm indicators suggests the document is designed to redirect users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=latest+android+processor+2021 PDF link annotation
    • http://ryyw.com/upload/files/2021/09/202109230332543768.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613854e24a582---32564701445.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/jovutokixeranakelagafawi.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/rekeduwupewisezizugir.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/4107964773.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/gulexusipizomugero.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/25108860846.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/86138991249.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161500aa1b1713---jaloselawokiwes.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/89326077801.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/26848356652.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/58739743942.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/puredefinilomegigor.pdfIn PDF document text
    • http://dalaichau.com/files/28310091398.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/96223341257.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161424de853897---rijadasarulonaziror.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/fuwebovexobirazubefi.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/43d2e2f1173e723fd97aab7dfb03dfbc/55196671133.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/kafezelamixunezitut.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/tovamorumidinakoraxu.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/11611492456147c9743ce99.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109280208359368.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/37589698786.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/70220339603.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/badirefeferuruja.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_off0000b582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB582 10712 bytes
SHA-256: 3a9c701459e2857ed18d5457bb042c048498e57be610c3bb507fbefdd92b53c5
font_01_sfnt_off0000ce4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE660 17344 bytes
SHA-256: 6c4d62c05e240a8105e31195758500f47c428782678f79cfbb8346402b727565