Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b16a0b9974a47af…

MALICIOUS

PDF

73.1 KB Created: 2021-09-20 15:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 591b6c2b20558f50301f2711a12cda0e SHA-1: 4201f1100e5585f6e11151f5d086f7dadddd10f0 SHA-256: 0b16a0b9974a47afb761d1deb7eba194be7c1b4e6769840cfb244b761fc3bf5f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document is designed to trick the user into opening a password-protected archive, a common tactic to evade security scans. The numerous embedded URLs, many pointing to compromised websites or link farms, further support the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=how+to+lock+contact+list+on+android PDF link annotation
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/99137063757.pdfIn PDF document text
    • http://skene.es/userfiles/file/41435353702.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/mipemepetetuzejaz.pdfIn PDF document text
    • http://royalgroup.at/tmp/57959870833.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35756246170.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/movuxagiwavazobo.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/kefuvutalotarekobojimal.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/gifudefof.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16138f112bcbd7---67977548331.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/guvusituxex.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/rv50jarak81qnnlthbu5lim51v/jufosaniranamogitajow.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/92187452767.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/72276020391.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9b5181871---sukusilusufenafuwevezomom.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pagila.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/16455927014.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/kikotuzofonusogez.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/53225555715.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/69148123750.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/mukapufukizit.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/rupikinunola.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/jibekagaxenejotitib.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/koxiluregedojivenekeviv.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_off0000bf2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2D 15640 bytes
SHA-256: 5c5c6a4d4770a165a006134998ef2eee5fac4c67948a33f0c55712088bfe5ccc
font_01_sfnt_off0000e719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE719 10400 bytes
SHA-256: 182c900231f1c3ea0ca6a366ea29de8f537483815ba9c7662f2668206dd3825c
font_02_sfnt_off0000fec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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