Malicious PDF — malware analysis report

Static analysis result for SHA-256 66424696765a99e0…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 03:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c3799fbda5bfaa464baa41607f23f745 SHA-1: aceba703751000fdd7730b756e5f56c50028dec0 SHA-256: 66424696765a99e0d5992d62dd47c2253d9a50a3eb715a33592cf880723602fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress upload directories, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving directing users to potentially malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=dual+boot+kali+linux+windows+10 PDF link annotation
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ba848c9b7---69384248817.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/fipipidexajefeg.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210913224533888.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a613196dd---xakekene.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/girobafiguxiguwokepawez.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/gikivij.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/gudiselomiwuwoxetajunazim.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210913194519.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/59bcdde3bab5e15845224dd35b8ee547/kixexabekizuvorajis.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/47167602007.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/tufiruginajomonomaju.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/264d9505c279f3f0b6c10912a08969c6/70150785879.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/zoramatodebemusim.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f618ee7967e7636f4eb3b3a4e97e7e0/9529743661.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/76909280409.pdfIn PDF document text
    • https://harom.ro/files/file/17730277040.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142cdc05416a---wikederozuwedew.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/10052929407.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378a0cb898e---sifomosiboleti.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/171608144113.pdfIn PDF document text
    • https://12shio1.com/contents/files/46276396135.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/nuxofevoripumoxe.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/87321327442.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/f901cf73062d8277484496abbd77f5d9/717113088.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_off0000b3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F4 10704 bytes
SHA-256: 1224e6425a36c8d17da4111d7f4979e35d5dda6cd6a81c4225216dd5d45fb7f4
font_01_sfnt_off0000ccb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB6 14880 bytes
SHA-256: 1adf3257a42cdd1995c8d15b664ffadd571676a10be499c7fe4754191cd73900
font_02_sfnt_off0000f239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF239 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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