Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca581e9353c59ae3…

MALICIOUS

PDF

85.7 KB Created: 2021-09-05 13:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ae580213892e85332b5764f72d34b625 SHA-1: 8e3f863b4f5868618d4a79b141c30072b392f021 SHA-256: ca581e9353c59ae39781d296752dc5c4a6472ea7694e3737d942a7915e6689ca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://epoxidice.ro/mm/file/nirazowofusovewitof.pdf In PDF document text
    • http://originalcheck.it/public/img_admin/file///kabefevikawal.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607435d82555d---wurekarivom.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a1dc81eb0---91528395957.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/59188736940.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607b08ca8aadc---zivegozagukunejulegafe.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/9ce0d2e0f86f23d22f6a2091978b941b/wumusegufesemop.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086bd25b68e1---86856840491.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/11188870267.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160914dac5c133---16744914491.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/mupadu.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/1paqp2n6nv509qp8827t1o85uk/xutudidivuraziguwasetib.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/79788211579.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/39089a25b830c41a002e8ec2bbfacbe7/32522964436.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/8553boo43pipou98ckq5ba6eko/wavorujimakijeg.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be2c63da01b---dibajanabuwunebi.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1611ce1d6b0394---29802404068.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/71448076344.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c861a2f3fd3---mazuzibobaluwovezajitez.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/1eecc59608935dead1b8c91ad9643792/30367624315.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/benejubuzu.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/27556286144.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/fefab.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/bidifexosabutenuz.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c317c216f1---bozevegukukatesoviga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=2010+honda+pilot+service+manual+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_off0000e7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DE 17768 bytes
SHA-256: 67c4bf3979465bd54aa2d9f2370a493742a94c730954bddf39ae467b104e2e55
font_01_sfnt_off0001167f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E96 11248 bytes
SHA-256: 2063a60a945783bca516adbff8602d04882668ea68ad43e67b685ee9e0cb5db0