Malicious PDF — malware analysis report

Static analysis result for SHA-256 e22d7c1d02deac16…

MALICIOUS

PDF

115.4 KB Created: 2021-08-13 04:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ecd2e2d89031a6d4e23018bb1add5a0c SHA-1: 2dacd8193ef34deed05c79a8ffdea36b2fa3fbc8 SHA-256: e22d7c1d02deac16dc008670b6b2cfa3bfb14288f36dc34ec92c7d7468e3c42f
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, with the document likely serving as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/6602655c1b8ec5be0f4098490e0d9270/sajujipunifewirogisa.pdf In PDF document text
    • http://alexhofford.com/temp/files/file/10927560824.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/35913456514.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/belofodiwul.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a385f69295---82973019942.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/62598600414.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/08b79fa1224cd3656c3ab692aaa8980c/pizumidonadirujuzenu.pdfIn PDF document text
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/32425256883.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/vevototifejosabeled.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/54363779036.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/titipuwisepozigig.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a083a3f9d---27696722747.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105e081d7aa1---xamojeribomo.pdfIn PDF document text
    • http://scarpatti.com/files/72616057197.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/71230144408.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2c78ecaffef07756f8ed5e93201be319/4408834793.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/hgm8qa0r2gchf4i4q3ugl3th4v/89107794431.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/32e9b614bfd479f59fb30633ac83b3af/borikufasikenuxofipow.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/rkbh9tdoh8bf537s8ic98q5n61/64449996465.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa951263b3---roxivalotowowusizonu.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/kevadozujigiwibexiredew.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/8605eaecafda54e1b6fc81d76e801fc5/45134345822.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/jekorigivipamefamud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=cambridge+igcse+biology+coursebook+third+edition+answersPDF 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_off0001610c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1610C 17032 bytes
SHA-256: 035bbeb43c288314c639c8c5fe5e29b7d5b380b5998316eb631b755ccd19ad16
font_01_sfnt_off00018c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C65 11380 bytes
SHA-256: 414dc41f5c3e2879d0f66927a340f748a55b481046c9ea42b2cd0af4bb5d00dc
font_02_sfnt_off0001a6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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