Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b1cf3d08c8a067…

MALICIOUS

PDF

86.2 KB Created: 2021-06-30 03:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0acfb0f7e4f5d3465cb1d802d894ce61 SHA-1: 481f1e0df06f7b3cee8e5cddeb351d4619699d0f SHA-256: 10b1cf3d08c8a067f6b5c47fdcf895a57d10008f79c3266d4831b342d9507cd4
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 storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://recviem.ru/img/upload/kokiranasomoresumutawojuw.pdf In PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/dpiovi7ddirqm42a26llbm65lq/99372794129.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/rurufediripaxojotu.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/66a2b270a4eca7c61097c996e8b82c99/vofajow.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/vekobopogo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ad462aa69---vazadalezovujuvapatefe.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1157446a2---78043626711.pdfIn PDF document text
    • https://ecoretras.com/file/wobesunotebagijuwu.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/jugomugufonimidigogawe.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/0da99206aad55ed3d3e0f6bfc4ea6260/tezawuxurekenawiz.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f007ca7710---40342605163.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/q1pdcsf61u9n1lok4bajn1qebl/tumigu.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/49810489704.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/49422476072.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/fanopelokor.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c018e33ea84---30970206858.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/xalojuwanatexazabagu.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/nalitezupina.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e9ce0a3f9---27945355012.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/lmnou86u86ak1n0c9ee2aikli9/19117658957.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/0spbvrhdoj88s4pdhspd23mtv0/wijesirejitik.pdfIn PDF document text
    • http://dzbnf.com/upload/file///gikikorifumax.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/be03f40fd4885f121b80bf9988e19bc3/43614417015.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/tegakunozotoliguw.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/981ad00bdb84b11aff0ab717189ac3b0/44629134342.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/3a662a8fb8885b1a2c849e80c7f8a7f0/keforenosefalotul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=chest+and+tricep+exercisesPDF 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_off0000f012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 10576 bytes
SHA-256: 6e607b521987af12b7cb6e0b9712b3b08f635657bde6f456e3711dc6b2014d85
font_01_sfnt_off0001082d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082D 16700 bytes
SHA-256: a69f49065d3ea27e07127e6f5d4682585678184e54139312e80a1bcc21ed9509
font_02_sfnt_off00013352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13352 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1