Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac35c9045f4ead6…

MALICIOUS

PDF

88.1 KB Created: 2021-07-08 00:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e548a138c9342f4f7ccb3cc4dc5b88aa SHA-1: f64b6a125dfba03a6676e0645541676b60c0d982 SHA-256: 7ac35c9045f4ead64e3f0bf1396a1076626bad85817c74d1f237242d246451a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's used to distribute further malicious content or lead users to phishing sites. The document body was unreadable, but the overall structure and URL analysis strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/27b25f1dce4fc0201a6f0152945f96e2/wogikarexipepabutone.pdf In PDF document text
    • http://bilmatbasim.com/userfiles/file/93550709939.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d23dd170f74---vovosodefiketomukegep.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf428dfece---81196971059.pdfIn PDF document text
    • https://emmaushuis.org/pages/gopanifitinakugovinubebi.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/poligopavugagideva.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/pupavaxevomukorudi.pdfIn PDF document text
    • https://medtek.vn/storage/file/36644816951.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079a94be5179---puwusumewov.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/41599808139.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/sederibaginaxonejefejivi.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750842c7482---31056315588.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/ef4f459d9393bede8cf1b76cebb747ee/garafuwiwe.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa4577b3f6---xififefumono.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/rkkpdgqol8fhn7jhtr3dki42op/vogol.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/fawamavod.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/79933487025.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/94429700940.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/11261554644.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/7sl7amd0rt3uk1s98bocqk8cio/9241307441.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/vipadogasunur.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0280c03dc---fivuwuvibib.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/80973766996.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/nu2scnuetou7lc300aolp96hj5/denimupovonitarasikedekud.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/7b2ds8upoe8up285gsrg94doi2/63664794020.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/pekepurajotiriralodab.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/fibifen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=palm+aire+resortPDF 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_off0000f57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57F 17404 bytes
SHA-256: 4b63f964a2d3ec11fcace3dd9ce0843fcd5cd8ab0c4b71d5b9d743a269524ba8
font_01_sfnt_off000122e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E8 10168 bytes
SHA-256: d90a09377c85a0bbb699cc4a5e0cdd08e61da03f7f66f7278da07254b236444b
font_02_sfnt_off000139aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1