Malicious PDF — malware analysis report

Static analysis result for SHA-256 f623feab4a73d984…

MALICIOUS

PDF

83.1 KB Created: 2021-09-11 19:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1fa1028759aef80ec48723b357285058 SHA-1: d5d260db3dfb3aa28e6ea8eb878ae05763068b00 SHA-256: f623feab4a73d98412a7ead7bb5f45284bcc34fda0fe65064b9df1514ffae9e9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document contains a link farm and a callback phishing lure, suggesting it's designed to trick users into contacting a malicious entity. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 https://mosconi.net/userfiles/file/20069300279.pdf In PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ff31704bf---batob.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/gevowonaluni.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/39334799032.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/f5f8d293f61c75c8a5e5faebea92efa2/dudujalanobiwelazowokitoj.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/29400454119.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/siluxapupibosapevumigu.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/6532946616.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/53207787158.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/58821442967.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/21710007693.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/72880857711.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/liwaxowufagerezerumefukok.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/43853983837.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f363b7b09b---gemiguvalowuwozolul.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///waroxowukilojaka.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/48108356352.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136bb9f2f343---ragikutavavi.pdfIn PDF document text
    • http://kesifveotesi.com/files/joxamubibugikuluxanexepow.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/wugipusaxiwok.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/19125189177.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/45870521111.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/9178185622.pdfIn PDF document text
    • http://jonme.net/ckupload/files/59492268620.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/21941066644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=dungeon+quest+how+to+tradePDF 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_off0000dead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BF 18616 bytes
SHA-256: ff145100d1e85d8d741a6219ce4203dd64b4757a275c2de52a32a0053f2892e5
font_02_sfnt_off00012666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12666 10724 bytes
SHA-256: f55ac031c25cf67a7b22f1ee540b52f636a7170922e4b270c1256d617f83ec01

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