Malicious PDF — malware analysis report

Static analysis result for SHA-256 102a9947d1b6a0cb…

MALICIOUS

PDF

72.3 KB Created: 2021-09-04 12:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 50df208d1f8a430eb20101590d611592 SHA-1: 9f9503edacdd6de7bfbc0d001e5dccec4b926a3f SHA-256: 102a9947d1b6a0cba0ea73b16c84bf5dd64ad1cd4f23dc43a2ebe5c5d1ced269
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The document body was unreadable, but the heuristics indicate a clear intent to leverage external links for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://citygclub.com/ckupload/files/78187830614.pdf In PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e6ced62a3ea---23584073012.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/r82tivk00tmcsb6em6nle3lh9o/xadexogozaluzinuwajesemar.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/hespjf0335ab14op3jnr6flaij/93915805482.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/51275185041.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/59403077173.pdfIn PDF document text
    • http://zxsolar.com/d/files/75008548897.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/63450991664.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/44824066987.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d1f7661a8---31017767146.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/burawufowi.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/4b26d1288446195139830c397f66b080/bididixinonawavejonojewos.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/kotuxaguwitotolow.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b793bd14d1b---karoxug.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/37397926513.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/42016005249.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a3bfda535---84690425539.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105e207742f4---beredaxugikudevigubop.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/cce4682dcb4941fa0d11dc0857a9c67e/wabarerifiwix.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/dunojitejusavor.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/xatokemisezixokulo.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/8a2f5773f6bb68c9716a94ae908bbc7e/zotavopikaduwufokulizapi.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccf2d2b714---rimupezufujolirevuzewab.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/05f9776746259e978ff23dd130f86df9/74264181329.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/mumidogena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=together+with+science+lab+manual+class+10+solutionsPDF 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_off0000b88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88B 11140 bytes
SHA-256: 65d9b4bbf3eaedc9672f60b8eb230644611e5a7faf4efe8ec7456663dcf00adb
font_01_sfnt_off0000d282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD282 15876 bytes
SHA-256: 4d82fbb892b706d0371ede3a6b934a67b33b79d11905857590397c1fe263fa5b
font_02_sfnt_off0000fada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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