Malicious PDF — malware analysis report

Static analysis result for SHA-256 4284874d9bedc024…

MALICIOUS

PDF

83.5 KB Created: 2021-08-24 12:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 10ab68b325bb71df437281de98fe3541 SHA-1: a2426c1b0da8a9cb932937e0429d82824eaea9f3 SHA-256: 4284874d9bedc02416bb87f9e73eb48d4ad77bc0a18550872e2bae042ae7a583
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a redirection scheme. The embedded URLs are likely used to funnel victims to malicious sites, potentially for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://homeopathyhongkong.cn/files/xesixikelit.pdf In PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/mijunodegoko.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/goluxuwezulodatobu.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/153731444.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161154cd9406f2---tafadupi.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/271be194266ebaa313d3591a386d209c/vifawuxobiropo.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/lakomipexofikivadetujefis.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d84c6ef62---dobobemizi.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/58265291471.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/97685075860.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/84362091580.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edb50927de3---wikilelasepuvela.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02cd971e08---dokobisenidosuladi.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/e57e6c430636bcd82148a7a5b7d208cd/nufoderowiz.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f31d291d7c---sujuxufanalefesufopirotes.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/74639102542.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/tofan.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/vebalufu.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/tomepimuboxezonetudutadix.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c200a4a88e8---27600265192.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/40450723871.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/075m4bb4fb8g4q1t7duh31ei26/26480991443.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/69709094428.pdfIn PDF document text
    • http://hydrem.ru/images/file/muziralodinavileraw.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/gibarojed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=suven+share+price+bsePDF 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_off0000e246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE246 10588 bytes
SHA-256: 80296237469e5f1724b0a0c1a847743e1d4314631ef02a8f1b47250ebcfa0e92
font_01_sfnt_off0000fa2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001123c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123C 17448 bytes
SHA-256: b3ed8fe10bbc00f09315e59b3573d7854016a77f2445a0485ea8eda2627a6b20