Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d7a384d29595e4…

MALICIOUS

PDF

190.5 KB Created: 2021-08-11 05:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 98388c15f153734fe885bd26959b6ba5 SHA-1: 814ce7735aa329e56c8b420bfcd8f87358cf80d1 SHA-256: f9d7a384d29595e481a798de33e18dadac2eb1888687958e8a3032c77c9e8e54
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 CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection further support its malicious nature. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7273

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xanbiente.de/userfiles/file/jeletonagixulakolosiwer.pdf In PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16101022aea639---dorere.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/padevasupab.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/sukixore.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/kiwamujalikatapu.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081493c06aae---mebawebeto.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5270ba646---96793790190.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878d59dded5---52280828555.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/14415163348.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608511aa040c3---73715744730.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa247ff8a---remaronavovilegi.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/11619060161.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/kixiwozat.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/pawevisatafibafojovuwu.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e01af81d10---fidanazujurudirixan.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a1fc962a---44388132276.pdfIn PDF document text
    • http://point-grey-1970-grads.com/clients/f/fe/fe7686cf254963525dc0bd811951f15e/File/74847969297.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160eded065cf8c---vevukazasuliguwivixul.pdfIn PDF document text
    • http://prof-cosmetics.com/upload/files/pifolavekilerulafujikubiz.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/fb0lg9ek5vdhi2k2jsnjhhjhq4/fikovilivibalu.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/19337832724.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160db8e4852c0f---muselesodorinosewujawaso.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/fc1cf7f62450627848778fc2527b25d4/tijerikukimajapivezo.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/85411003628.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/kobebefuzemovosanu.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/g33blqfb7l96denign5mr21f68/73780493548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=lagu+one+piece+epic+musicPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000206c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x206C3 16132 bytes
SHA-256: eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8
font_01_sfnt_off00021c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21C2C 39404 bytes
SHA-256: 851bcdfc513e5a5dfe5dc9c918dfe7d0410309b3e298c61c93d9997333e952aa
font_02_sfnt_off0002896d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2896D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0002a17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A17F 18420 bytes
SHA-256: 50862f3af3890cdb3c46e824682a00903ff40a8e2362dc7a3b265bb3d670677d
font_04_sfnt_off0002d121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D121 10532 bytes
SHA-256: a42df33cca2fb69f1ca90de50da769b3209f9b0c5f836c4db38eed0298b14b95