Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9e60a043846218…

MALICIOUS

PDF

88.2 KB Created: 2021-08-08 20:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 3302837989097796558f04a2fe39c529 SHA-1: a844baef8578cb0e6bd17f2a4515e4f1b065d1fd SHA-256: 9b9e60a043846218e4782e4b1c329718e847f027fb4b73974544ea7a33fa4b33
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

The PDF document was flagged by multiple heuristics, including ML classification and ClamAV, as malicious and specifically as a phishing lure. The 'SE_MFA_LURE' heuristic indicates the document is designed to harvest credentials by tricking users into approving MFA requests or entering one-time codes. The embedded URLs point to compromised WordPress sites, suggesting a tactic of using compromised infrastructure for hosting phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/h0fhg2gl25cq6geksf66oe8i7m/23232146210.pdf In PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/wozinuzowesezuvobubiwaz.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf98ecd80ec---kobobotufovir.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/6aab31a02ae2315a181cf43031951c80/gotokaxiwanepabekoxani.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce61ac7121---71599425942.pdfIn PDF document text
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/29393834294.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/28557667805.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/e2u9blo7873nh02f9l2g2rdm36/90890435325.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/vosekotog.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/aioj8g56sa2r03rd1afjmjsabo/xovaxag.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/1064203253.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/93848479114.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/xagemabosesomugumosofe.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160afa77200887---wadoto.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/sagifoloz.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/pn3iqvugp403mq2huojo3ffuf6/56923282110.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/21411725294.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/43879694671.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/49736431843.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/duzusol.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/bajuk.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/50354839278.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/fodidivufupufalekefete.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/8322273839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+do+i+find+out+what+my+google+voice+number+isPDF 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_off0000f472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF472 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C84 16724 bytes
SHA-256: f19ed5e15728d74404d219357e462c04da83195b702e53b6eca0a1ddc102e3b9
font_02_sfnt_off00013812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13812 11420 bytes
SHA-256: e55048a818c16a7931c7870247525e125e27475fbfebdef290f28989b944e53c

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