Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e8ec97d81248dc4…

MALICIOUS

PDF

85.8 KB Created: 2021-08-13 16:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dc9bca5bf6e75c5a67a6837a37076e06 SHA-1: 356d7f4c5135e13284521939588e3f7899832312 SHA-256: 5e8ec97d81248dc49cabfdf65bb2dfc3e785f9cfafe912c1fe30bb139bb83b52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics suggests the primary function is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://laborke.ru/uplcv?utm_term=how+to+do+a+macrame+keychain PDF link annotation
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0f0f21a93---75600286250.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/5uat6d16f39rqada6ro03nfb62/99124144437.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/funinigujoparinuzod.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/baxov.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160732d5d5b606---34562707656.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202106140145567940.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/dcd002a876a96628e27fc3b6fdd8f891/63108227014.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/af4d197ff0f7de3df40f03e438485a7f/gaziraduvatipejiz.pdfIn PDF document text
    • https://paradigma.bg/uf/file/21514555367.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c5c250d2a0---woduduruliked.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/39000070941.pdfIn PDF document text
    • https://estoniapools.com/contents//files/24027874800.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/gga5e41vp9b1sg25g5v19eus5t/17950917609.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/arajvghi4v5utkfc756qu6raac/xipepixujibimiboj.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e0bbe667cda5ae53db2c4bb3ab8a885d/nunotor.pdfIn PDF document text
    • http://oinfo.cz/userfiles/file/zekaxiwelivetenukebexo.pdfIn PDF document text
    • https://asken.as/bilder/file/42684318172.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b73bd746d9---mominofe.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/51783634620.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/l7hrnnqr2jol7jm5jmiot4k7kh/winesagulanamekatu.pdfIn PDF document text
    • http://skupka54.ru/upload/m/8972329148.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/flec2u57kqtbittr01ci027n9f/38263740926.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/55469836768.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/663236ed95712729ab6c9080cada64a0/37848731245.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CF 17764 bytes
SHA-256: 0a420ae8c9923b89e28eeb7a6b6e6a16a9e6165f5eec9efb9d351bddd5f709dc
font_01_sfnt_off00011721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11721 10704 bytes
SHA-256: 8e7a6f71d99ca207574d774548937d3d51cdb2dfcb7386102afce70b791b7162
font_02_sfnt_off00012f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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