Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5645c5553f81a2f…

MALICIOUS

PDF

75.7 KB Created: 2021-08-15 21:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 34a7c718e747f102ff1cba13432b1b31 SHA-1: b486b1062a38a5cb8c45246be17ca571216c3f72 SHA-256: c5645c5553f81a2ffb372bef6cd3d112c0e5faf75ee4664dd2a0ceaef76705b9
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 and disposable hosting, indicative of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing or a trojan. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940a4b923fa---88709177237.pdf In PDF document text
    • http://btc-ltd.com/upload/file/pufinavefidurawagojato.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/63408482790.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/cef651cf01414b975642af98c640f67c/74203549821.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ed0e42ef2---janujava.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/xefofajosome.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/1257984041.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7e13a4ad5---77087586832.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eab2fdb4df---lixopitaxepir.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1608265fa489f8---83551859428.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/283efdaa20c582248c2079ca740ddf8f/44061533150.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada80ec9ab3---41966028068.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/48128785922.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3b880ef6d---81529898204.pdfIn PDF document text
    • http://brlairport.com/images/file/nikejufakaz.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6cd224618---99249421232.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/kghudhnhe6ugbr39akjif5evk3/19526697183.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/zisepam.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/85370596842.pdfIn PDF document text
    • https://laser123.com/geektic/files/50747624948.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/b3cfebb59890e175809500afec46ee6a/rinezapu.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dogenezuzilolasagikebu.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/5sb4pluolncqpqjb7gsfm1dad5/lenikubilibubaguturet.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/mudijuga.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16098b6df4f7e1---63841700343.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/06/19/10690704089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=which+null+and+alternative+hypothesis+is+an+improper+form+group+of+answer+choices+and+and+and+andPDF 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
    • https://doi.org/10.1002/simIn 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_off0000c0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B8 15960 bytes
SHA-256: d549e4ac6f14968763b1a3592e8ca792c88b154385ca3a05ab39108784e1861e
font_01_sfnt_off0000e9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D4 11424 bytes
SHA-256: e52606d9da851036d8e8abf6faeb7906a7b44b7396c9cbc49223a2325583832c
font_02_sfnt_off00010480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1