Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23169fd9b9eb27c…

MALICIOUS

PDF

70.9 KB Created: 2021-09-24 21:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 7ff3f25ad3479ae0d0a98d6cee1d1f64 SHA-1: 06c9701f1003323ac5d9e28a1d3286197a2b43a1 SHA-256: a23169fd9b9eb27cdde61e6514047adfe58dc08cc0ee97def9575e2672320c8a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites and disposable hosting. These links likely serve as a link farm to redirect users to malicious content, potentially for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laureysnv.be/uploads/files/32847645702.pdf In PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/mutowotemewi.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c4e6e2e0a---zimomitevutibebeje.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16148a99c94ec7---16268198003.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/77420267513.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/12163056955.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/365739040.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/16510278450.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/o6ml5rnh301k07k6gg5p0d6rq6/xufegifopi.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/nipagasedazodarozu.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/67527539165.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/gowalironesizenix.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/t1qisqcuthmdeisb2kf2hd9vt5/96349245539.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/golelumaforaxivasunesexul.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/49369819478.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/97003007296.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/76451306254.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/017378ea59a00fa0e3bb810f29764d96/60994012766.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/c288a07c52d7e426a91e2df9176a94a6/rekasano.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/jidepes.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/45757602305.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370454b0adb---7918380563.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/46227747557.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/221d30c1108c0e7781afd6eb1d0ff04e/79164358077.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/kumebirigemoval.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/73453220400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=aplikasi+android+untuk+pc+selain+bluestackPDF 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_off0000b63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB63C 10820 bytes
SHA-256: d73c002fc4cda56d21fdd16d67bd03b84ff8cc3e32d881b2545c6f5cd6e2b611
font_01_sfnt_off0000cf1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1D 14708 bytes
SHA-256: d2b72b5e7737efc7157958f73a1c9cf2b7c30bda38a5d305d2d7d7a79d9a3e40
font_02_sfnt_off0000f3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1