Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39d855e920e7d12…

MALICIOUS

PDF

80.2 KB Created: 2021-08-28 22:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: c4936445798a7a2d725613f90e00c6bb SHA-1: dd8b8e97d9d430e619b918eaea7990dbe01c0f88 SHA-256: b39d855e920e7d1289003507cc99402c593f5d828a7799e3676f00e81759599d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.lugashotel.com/data/editorfile/gaponarojowid.pdf In PDF document text
    • https://digireg.si/upload/36334409672.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/76892063395.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/29793360196.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/zekobo.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/10272398272.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/buleme.pdfIn PDF document text
    • http://cityfate.com/files/files/52998652217.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/vj77rc9io5eadtajcl4gv5mu8c/wagutumelivipideramita.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606da6a6bbfb7---nagub.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/e1fd7ad96fae50a5b831aeb665a8771e/lotiduvefunepeporemujur.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125afc9eb60d---mawuwujisenerugimedub.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/dd1dc0341eb228bbd795f406bf0c97aa/timipoxek.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/zemiwax.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/wajukizitumoropererumoj.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/d90b4a0e098e023c05fad917133a40e0/5889031052.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/96480414760.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/l9ofa62m6014mis19oae5h2fp1/sokagimimidiwej.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/rusoboparopa.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/gukawud.pdfIn PDF document text
    • http://eternoohydro.com/d/files/lajuguwelukoli.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c730fcde42---lopesaxamebivaxilodo.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec512ab755---vuvumewonikiwor.pdfPDF link annotation
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8998477ef---rojumenenajagezew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=only+connect+answersPDF 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_off0000d4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F4 17480 bytes
SHA-256: a727affd82a058125a6d6bc90fc1ad96931fee45bd49792b49ca8a1d6a0bb121
font_01_sfnt_off0001026e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A85 10356 bytes
SHA-256: 271149bb272bf73575567274532d17040d2e0ba3a329283c19bcad2e8e809996