Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd394cc97a7db5f…

MALICIOUS

PDF

91.5 KB Created: 2021-09-04 13:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e8063e3cd496cc47ed110cb8beec6b26 SHA-1: 62df48aaa23000ece2fe977ad1c2aa2a62a7328e SHA-256: 4cd394cc97a7db5fa5e87d7dcdf22e54e0d4c66a5fd5f3ce9645159ae26d78e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of external URIs and link farms suggests an attempt to lure users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f8efc6491e27745d0aa7aa98ef73c255/togukagagegutiduguvij.pdf In PDF document text
    • http://sintellect.ru/Repository/file/729460851.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/98582694766.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/85375307386.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ketowagonekivek.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/d7tcfacma22p3slthq5ljkcb25/35397280890.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/7cce4ed5ceab0933d382213d5af48329/jaxatizepugotetun.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41ac9cf2ae---gusirotezitodulejib.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/30003099635.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/85216016952.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/dinumujivileridededifomip.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210702_05D4690614F92ABF.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b270653c92---wibaziwopobor.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/98618180098.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fd115d9c6---nijas.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/8343e23333631ce8075449aeb483fca9/89579998588.pdfIn PDF document text
    • http://robertsrucker.com/clients/7/7f/7f5ecd1287ec2152c36a7dc1808edcbf/File/58539155695.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20217555309460.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc66da152d9---52751194264.pdfIn PDF document text
    • http://kechengchem.com/upload/files/fapakiko.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/toiu70stbte9ldcvdmg4d26kvo/65545442398.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/lelesikokokupuzagoko.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac936cf490---veluremorodisimubib.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/xobimerodezope.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37bf93b2c5---nenexakatokawo.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/21579534528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=complete+civil+service+reviewer+2018+pdfPDF 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_off0000f9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EF 11200 bytes
SHA-256: c685993adbc7d899212bd215a2b74a1c9d5b61fb8ced9df5491f37b662c56d58
font_02_sfnt_off00012c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4B 20532 bytes
SHA-256: 3fae3b00a6270bc3fb5fe2ad7683d46a9e9c19d838ababf1cbbf4ff2a7536583