Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8476007a93ac1a4…

MALICIOUS

PDF

86.9 KB Created: 2021-06-27 06:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d28826e583be84a2f13cf1cf914c340 SHA-1: 602cc9ff2c2e593e1378bbbc6ebdb155fabdeee4 SHA-256: f8476007a93ac1a45d48f8df25c6f19756229989e5861ce649c8c59fe1e67ea7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress sites and other disposable hosting domains, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to lure users to external sites that likely host further malicious payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://ownlines.com/upfiles/file/9379965994.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079174ca5c78---20968597606.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/11d481e0d4817f6d1e307f8b5918f68e/xisivibobatedugul.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609e287469259---gatuwemuzifajirabu.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/cbcf749bb65dab29c85f89843066eb31/29295346372.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9f63eef64---73028283575.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ac7d7d7f3---kizepera.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160af6eb600130---nikazovuzarabovo.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/50541e861ecf8f3af23c4bd6006e4423/24406336318.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a0e85b5b4---12314663783.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/6e51fb53ef55bb2d36a9c3defbcb752c/zalogexomuxapewukonataz.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160743aec1d9f4---4017173642.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeed0e7b97---40242173482.pdf
    • https://bataretak.com/img/files/file/75683897607.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/opk6ibobtq2v41939p8nqbipo6/53066346901.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ad0760086---90886714459.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/ddul5hq7uesmvtidu9fra28nr3/finogarukesefojepenemuk.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/6gq7bj6vt7gulbc6v427emblt6/manevubu.pdf
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/4a8e2e300ce6098c8699361995d5e2f4/13633260602.pdf
    • http://esthebel.de/userfiles/file/9588703803.pdf
    • http://slanfusa.org/clients/47225/File/mazale.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/9f072596fef195bd2969a93ebe221f4e/27091002966.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608771026167f---mamulu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+power+of+slow+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eff7.bin
8d20283ca7d777d1d43d458fb66941c5d687c10360613ba190d97df0be74d60b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF7 17628 bytes
font_01_sfnt_off00011e16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E16 16792 bytes
font_02_sfnt_off0001362d.bin
2b405694ab8f6943f7c355b8f2559258e4b747977e94b919cf421cd63a9cee8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1362D 10188 bytes