Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9320b2742b0d87…

MALICIOUS

PDF

84.3 KB Created: 2021-07-19 03:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1ad24163e43ac40e60775764d19fe31a SHA-1: a21712fcc5b7ef8212920f10e622176ef963b139 SHA-256: ef9320b2742b0d87aaa594cd010c96cf28e7a7bc1b37834ed8798a0e634ac716
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1534 Steal or Forge Credentials

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, designed to impersonate Microsoft Outlook for credential phishing. The embedded URLs and the nature of the heuristics strongly suggest a phishing attack aimed at stealing user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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/S30rS-6n6vg/uplcv?utm_term=applying+systems+of+equations+homework+8+answer+key.
  • 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 http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9ef0de54c---93180446947.pdf In PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/72666824539.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/kupunajinipa.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/bizimobepemobuwawirofusof.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090dc8236074---parirenov.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/a700cl4f1qpgrrabaa7ofu2o26/lafuzogikono.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3b2cb454a---87701614000.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/62573607799.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/72680a98d31b89a73cd5c19a078c9187/83067298624.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/65rt6q7sj4ani4hk9976nnpb73/jotub.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/lg6uhk44ar5ou2cehmpg04v71h/xivijuzexaxilus.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/c7589f305daf353c25d2d42f7766d64e/bokevol.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076602497f7f---31734397175.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/85526140280.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/8534bf8f38b8f3b3851d756be618199f/motijafamumelo.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c91baa323a8---nosewobi.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/zewewujim.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/gebaxebonakilexizudo.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088df7ba5266---sapamujudu.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b142659e7---bumasele.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/dojimaraduzurib.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/xazeb.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/besodenibebuzo.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/95371550429.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/52583009960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=applying+systems+of+equations+homework+8+answer+keyPDF 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_off0000e4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B6 11532 bytes
SHA-256: 03fd9bb78507606d7bdeff40fe7db24f7df1686c0156be7f01664ae835c94045
font_01_sfnt_off0000ffa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA8 16792 bytes
SHA-256: 4c7af9b3eea8afe00250cd2571ac20d6d2e15cb14e081021484f72f974237c09
font_02_sfnt_off00012b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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