Malicious PDF — malware analysis report

Static analysis result for SHA-256 b02de7664b067274…

MALICIOUS

PDF

88.5 KB Created: 2021-08-12 20:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b5b1c658f68560732a67b3dbf6870249 SHA-1: 3dd5dc7f69b0f985896e7dbdc9a827fb429275a9 SHA-256: b02de7664b06727436e5b5792bdb0c2da1402f7a311d2a7b1281866174af43f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely for phishing or SEO spam. The embedded URLs, such as 'https://oniceh.ru/uplcv?utm_term=how+to+connect+jbl+bluetooth+speaker+to+lg+tv', are used to distribute the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://oniceh.ru/uplcv?utm_term=how+to+connect+jbl+bluetooth+speaker+to+lg+tv PDF link annotation
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/f7ed45e061c4e071ce0383009882c2c7/tabixolabikekigolumug.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16114d35bcecce---66242118753.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7d57bf733---23042717843.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/073d05397e7fcf72fe4c6a792d94fa41/lodepawoxuzokuk.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/53553361196.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/fijizi.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/79205423511.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/gimelonuje.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/84482467106.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/worosuleporatureki.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/6uquqv6jhhvosg76jfcamjd426/50901629655.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608faafee7551---bipasenij.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970c5507639---bunonowawokali.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc6b175f72---palitokeseluzukujoju.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/54884263440.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e8017b251---5955914216.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/baguledijazoxosejemadud.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/60660542676.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/d5e37b92f722cbd6492d543316a6c481/60887743970.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/16951302696.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/idr2h9khub1oc4a4jtfajafigl/jekilazirenajotinetizedug.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/novefatatorimoselinose.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/b6e4b0bc9a170df5b60ab5377112eb8c/vufukuferajaz.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_off0000f55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D74 11164 bytes
SHA-256: c1c71f60d5e981b1cfc61c49e0b4c6e0ec037c44d31191aca80c4d3273aee897
font_02_sfnt_off00012760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12760 16776 bytes
SHA-256: 545a6c3364895f09788ea1bead86ab7a22eb128dacff67a5a6dce82a74c53284

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