Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b1a3483327c678…

MALICIOUS

PDF

87.9 KB Created: 2021-07-13 13:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: acffb99f12e9fdd99f73bdaa11aa3796 SHA-1: 86b0a8c8f8e23dffafd69ecfb2ff68421e82d246 SHA-256: a7b1a3483327c67857478ce3eec72a12635e6995a0ad72536bef2749c0d265a2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1555 Credentials from Password Stores

This PDF document is identified as a credential harvesting lure, specifically designed to trick users into providing MFA confirmation or one-time codes. The document contains numerous links to external sites, many of which are hosted on compromised WordPress installations, suggesting a phishing campaign. While no scripts were directly extracted, the presence of a "SE_MFA_LURE" heuristic and the overall structure indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096277ee334d---28450454597.pdf In PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a258d262400---bimerulidazoludofelil.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210609_9AD4289F967DDDA5.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202161672152661.pdfIn PDF document text
    • http://d4sontario.org/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/5575458954.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d190062ebc---tuzowudixekatepesuwa.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/65771874460.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/45023507227.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/6234420570.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/78a538640a8596220e1f2f1e7a7fc320/80865961506.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb18560bb---37863149039.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-8/20210608225436598542.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/bg6glc6s8tdo863e2chs3fim63/wumexebugugevedimurogeba.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8c26c6a62---63373577106.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0457ca3a0---14065459978.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/43538591979.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c451ce7bd---xotovozopirewuximatigug.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a80b639afd7113c2ceb3b9edd52d4efb/fotegafipimikuniv.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/lajasitenedewuviju.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/83837197cc9f8102ec49bf5cb86473ff/pokofebabe.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/zanipipofatixaj.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a41db67c5f2---85191717005.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609251a341f03---wexijaxunepigelik.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/96265742480.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/2b68abad93870ffd3607742703201b2f/zigizepikusedepiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+fill+a+form+in+on+emailPDF 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_off0000f651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF651 17140 bytes
SHA-256: 58c30632173f9c39db6d47aa95ed8faa43ca9f648ea19c551b11d491dab527b0
font_01_sfnt_off0001234a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234A 10284 bytes
SHA-256: dd7c5dc988ab0e6275c13c7c8da7ea1e00822b97d0299bf2c9944ee00dd5fb8a
font_02_sfnt_off00013a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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