Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb8a016f76743254…

MALICIOUS

PDF

133.0 KB Created: 2021-06-27 22:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 25a54fda4660397e0b03f5dfa38ffa47 SHA-1: 853372eb5fdd93784bb403688ee1c3de7b467384 SHA-256: cb8a016f76743254c5971760877a840f66f4dcb83f9080bc635a328e2b36c383
196 Risk Score

Malware Insights

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

The sample is a PDF document that employs a social engineering tactic by luring the user to install a browser extension or update. This is supported by the 'SE_BROWSER_INSTALL_LURE' heuristic. The document contains numerous URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://catamma.ru/uplcv?utm_term=work+experience+is+also+known+as PDF link annotation
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c9be44563---60457491141.pdfIn PDF document text
    • http://roughriders66.com/clients/f/fa/fa96273273f04fd2a06feef12b1e4d70/File/kigodilezobivu.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d264f3a1edf---miriparojum.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f763e6c2f---30702685398.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc746fa4785---48231062803.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/vuwivazabiluwepafo.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/24812fda13b179b8d587451505cf6b97/76215339238.pdfIn PDF document text
    • http://elitvorota.ru/f/file/92589795492.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/6b6bee681f69b456acec397c58dec1ef/ludelopiditef.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/26/file/20210626_031940_182.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c680e265f71---jemujelusutawunax.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/38727213669.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/c484ee3e28b0b054f9bb6b8af3fe30de/80163169496.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607871e0bb3b3---44356850280.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210602115110.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160715c45006f6---96104305818.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/janimiwesigubakiper.pdfIn PDF document text
    • https://purefeeling8.com/data/file/43357499516.pdfIn PDF document text
    • http://ciskmv.com/css/file/jinibumerefivewofojogop.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b21e2b12835---nonudew.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607e787112dfc---38113874446.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/de341ce6f01e08924a0272bba27a68a9/6058144333.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/gkbrf459jug16q05sanfef9d6t02mss2/42575263193.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/ridatosexowagesorig.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16098a280925d5---37275976133.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A764 17668 bytes
SHA-256: 526691d945398721e087f0be5f9fb31ec480249b08a99e8f047b01893b85582a
font_01_sfnt_off0001d5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5AB 10544 bytes
SHA-256: dde70f2881434ede3c9ba5bb14ee2377563e815d67c7c64249bc4d6d6e3c211a
font_02_sfnt_off0001edde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EDDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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