Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0ce978c7a8d651…

MALICIOUS

PDF

91.9 KB Created: 2021-07-01 13:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7ebfb1fc9ea836a3a92054be924c5e6b SHA-1: 1c66e1e5240973898d602026cc21b83a1cc5fbc6 SHA-256: ac0ce978c7a8d651c96379472ee4eed582ff44bc2eb1072ef6503ee6ab161bb7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the PDF being identified as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://sciattella.net/images/file/43886873797.pdf In PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608d20eb087ac---dapeguf.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/2dcbca38e4201f47fae47c8d3bcf3039/kuboguvagujedagikurif.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/4cd140a84437adb8d75f0187872fc31f/57998404385.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/dofetaxod.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/a2b8427ae870feb4624c054b96e1619b/91524865166.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/dilal.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/85759795407.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/dajuzojerewibubudik.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075a445e5113---puzaxugofefamubeninosizes.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/44149154559.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/28j8gp6nl728bcegmbgvnn1tan/kavoxiw.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/1dce533131fdfc458350e096613c4337/mijufanonujotirewan.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b451ca1035f---ribinepetak.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/52e79349836f82f97c0932f23680be49/kefaxuzaxatobimixufoxus.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af168c5d09---14345649912.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/c30i24r2m3b36l893v32mnsaff/zebakezuvositatuzam.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160947582d1fd9---dapelikul.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd617294d43---sutodupeg.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/gepari.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fc1aedc8e---vimemaxinovoxifa.pdfIn PDF document text
    • http://omg.su/upload/File/68473779603.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/08c847d9fdd0b0ac6957c1293780128e/bolapetu.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3af4fe5f71---49632820808.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/fepeginamulilapiges.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/dofaxoduwarutitidiramegex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+tell+when+cabbage+is+ready+to+harvestPDF 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_off00010256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10256 11048 bytes
SHA-256: a2a6c311aa1d505f5395d429d326c0c3604b924bc59c74809f17ee4632f856f5
font_01_sfnt_off00011bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E2 17604 bytes
SHA-256: a0051e5eca253cbce324839f93e96a7e14cf789534eeec7808747c3dfb3af398