Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ec1cd8cfd5ebfb…

MALICIOUS

PDF

79.9 KB Created: 2021-09-01 04:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1654f607147aae7ca04dbd58398be5e5 SHA-1: 4d72e9b7f958bdaf23d5a1454e59d9510f1383f1 SHA-256: 58ec1cd8cfd5ebfb9ce25df74ca9a0bb92eae892cfa9a0a46243de3f60d21bf5
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning model, indicating a high likelihood of malicious intent. The document impersonates LinkedIn, a tactic commonly used in credential phishing campaigns, and includes embedded JavaScript which likely facilitates the download or execution of a secondary payload. The presence of numerous links to potentially compromised or disposable hosting sites further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=unsave+video+remove+this+from+your+saved+items.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bluecars.pl/userfiles/file/mubimefoxosizosanixi.pdf In PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/3d4e0a5b4959fe3b197dc6296f92c3f5/72053654997.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cc336e8c2---76490889499.pdfIn PDF document text
    • http://yuhongzg.com/d/files/limazoj.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/73812018711.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/lezonuxusasinuwu.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/doliwozuwaf.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f600aac05---tepadefalikutunotumoxegos.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/56302766082.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c851082ea4b---tumuf.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9804be3bd1---44014721820.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/89110881274.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078624081700---limajujizidakuzaguke.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b314014fefb---gufafe.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/negomijalazureke.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210728_AB53D065E1C23CC9.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/tutagabufuvivafot.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/21736f69452d59e6e087003f2cfe7d24/34881365642.pdfIn PDF document text
    • https://ovth.ch/userfiles/files/vonukakikupusij.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/metaluputazasa.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/xepewixaritiwugowiliboja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=unsave+video+remove+this+from+your+saved+itemsPDF 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_off0000d506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD506 17224 bytes
SHA-256: 6ad5ce2618095ca39757caa99b0a112facbf3651ccdd04bdfb7cf003c0985dd8
font_01_sfnt_off0001010f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11926 10860 bytes
SHA-256: 7953664405f82528725b8604fc7ab7694cafdb39a1de30200a5fae08c84ef01b

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