Malicious PDF — malware analysis report

Static analysis result for SHA-256 80416156300d7702…

MALICIOUS

PDF

93.0 KB Created: 2021-06-27 07:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0cd77f34ba777e3b3d02590594aab343 SHA-1: fcc1f03669c6374bbf303209519c251444ab75a1 SHA-256: 80416156300d77025eff09a20ad140cef6c9ae4573b7eeba6ff582792884d00f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95' and the ML classifier further support its malicious nature. The primary function appears to be redirecting users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://dallapietamarchisio.it/userfiles/files/54952588731.pdf In PDF document text
    • http://mopron.ru/upload/files/wodaxod.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd56e5209e---rudixakopi.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/21vpo6lf3ap978lgicjepsb8il/96775138449.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/87623567613.pdfIn PDF document text
    • http://jucal.es/images/file/jeziv.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/5d2fa0ec9003e5db8754fe444d72dc4b/wekipetaz.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/lr9c6m8h7rh3dor9hnvehpcljt/41439615165.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cbdce1292---fulamemitiwijovozigov.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/rituwogizofinew.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/65768387186.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/jegunilinuzomoxapolerob.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/wupilatazuru.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cf8e37d10---16897683762.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210621031240128.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/nodutinabuzomidewabukikop.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073110a1afee---gexoxomaripuz.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/bn7nvguqvoq1hj59t0t4e2690j/88378490131.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/mvt89745v20d37ke887peknbf7/96172719562.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/92724557834.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/aa69e1da36c4936dccb59bf768c28ad3/rowevekegenefevuwusif.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160706a04c8a33---movepoduwupud.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/fiwunub.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b88ee75d5---14138894119.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/4ac90f82a7fc8d53458cec80e69ce5e2/584479483.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce111c5c39---32708079610.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e368250f2a---kemevevilarisub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=areas+of+pmbokPDF 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_off000104da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DA 10392 bytes
SHA-256: 4efb95278b88fd8eefe51ad62e539615800230c888253141ab304d05e5cbe845
font_01_sfnt_off00011c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C31 19684 bytes
SHA-256: 11ad65a7bc97ffc4ecd2e28edfc014d1482f2dde58340ded05a5cab6c48d753a
font_02_sfnt_off00014ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1