Malicious PDF — malware analysis report

Static analysis result for SHA-256 168ac41015ac187f…

MALICIOUS

PDF

94.1 KB Created: 2021-09-02 00:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9db2fd7a3c2901a1a97bec500c743043 SHA-1: 69779b004aac5ab493cc6bdfdbfcc93701300599 SHA-256: 168ac41015ac187f80b33c2f535c41973153d7685027156e0931c5a749d4cef4
204 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a high number of links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the download and execution of a second-stage payload from one of the provided URLs. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20a2d0d228---zepapusupabegafumaje.pdf In PDF document text
    • https://malashealthcare.com/userfiles/files/gisofewopulu.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef43c3a2eb---newetejogibamen.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/71e7394262dc4b87974fef3a6a4a7308/26835286348.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/0277371848f2c92ddf8a62aa63852239/kowamoxepu.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/kinupetevupabatonojunomok.pdfIn PDF document text
    • http://gekon.net/userfiles/file/tapunegafiz.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/a18cf8c28b6026cf93db3804f45a789e/67357317268.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/bazusewuropisapurajawag.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/977063ba20a5c8ffee251f216642f926/91879611607.pdfIn PDF document text
    • http://dsagco.com/Upload/file/moxewibobepinuroromewa.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/xamokutoxakikamusexal.pdfIn PDF document text
    • https://fultoys.com/userfiles/duruburujaruzeja.pdfIn PDF document text
    • https://lanjutpt1.com/contents//files/vodosojedawadomevo.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/2953240030.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/rabuwebikaxil.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a940172ddab---11261798353.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/724214870d826890fa5f14b49debfd75/36191078019.pdfIn PDF document text
    • http://telektrans.hu/editor_up/lazatogalujiz.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/61297709201.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/73068056869.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/zebejot.pdfIn PDF document text
    • http://planetamama.ru/files/file/binerawiwadiz.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/xesavebejetupigajiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=muscat+and+omanPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e481.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE481 18544 bytes
SHA-256: 74a40e6fbaa5730bb0e82dae7f7319d308d6c03a6c0bff27ec3fce0ac6f70b60
font_01_sfnt_off00010207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10207 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1E 10256 bytes
SHA-256: 4f88819e687001c6d56e33bbdda164c2a6b90b44e9ccac6efa4549f8d6d756a2
font_03_sfnt_off0001312f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312F 21376 bytes
SHA-256: b59996f2f22e2e74d06dfd65f9978678036992ab649abcd3fd52196f8f351bb3

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