Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a77c6a04e3f9dc7…

MALICIOUS

PDF

84.0 KB Created: 2021-10-09 04:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1addc081ecfa18ed8a50f0ed5fd011c2 SHA-1: 4303894adf9676a0e6685b9997e010a78a7dc902 SHA-256: 6a77c6a04e3f9dc7fe3d84e3df98e2d6f7f5a6ba2c6266d82d2789d2442c9515
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://styliststudios.com/imagesTE/file/gerelaxanuxakupisa.pdf In PDF document text
    • http://tamtamphat.com/upload/files/32419394317.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/lusesin.pdfIn PDF document text
    • https://securitydm.com/slicice/file/5114713637.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/93322772732.pdfIn PDF document text
    • http://rcmo.ru/upload/files/natobufabobinolodofixiliv.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1615088e301b80---64030624928.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fda299b103---7027472504.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210908095050299.pdfIn PDF document text
    • http://ausafe.net/images/art/files/tojuxopafugulega.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130aef40d97e---pegufefotagilobubalojuxo.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/58011059582.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/bosetatem.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/12991991930.pdfIn PDF document text
    • http://dasbluemchen.com/80196578267.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614931f031e86---kumebakesefipopedevagob.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/denibiletebub.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/87444128853.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/kerazomelepimo.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/71145857672.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/7mi17a3trjr57bf36d78pnvfvf/sujagijuki.pdfIn PDF document text
    • http://apcmagon.com/userfiles/dazejebixefereguguw.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/52737059611.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/xavidujixutivedam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=god+is+holy+versePDF link annotation
    • 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_off0000e154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE154 19556 bytes
SHA-256: 44ed4cfca2018717d272a42377c92e2db57517a16eefca9c8106cdbe897baec0
font_01_sfnt_off0001139d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139D 10200 bytes
SHA-256: 25e6e591bf7568f99aafcc68aade721c10dd0024fc6f4b5cc8ab8cfefdc684fa
font_02_sfnt_off00012a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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