Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb674fed70c63c19…

MALICIOUS

PDF

93.3 KB Created: 2021-06-26 04:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e7eeff6261a361edd63cd1896bf693a SHA-1: 2ee6d54dd0d2ae15fbd1f2c668a4e2910bce78c6 SHA-256: bb674fed70c63c1981ccf253655efeecb901d96f318f85f1db33e1aaf70dfc1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://nomylo.ru/uplcv?utm_term=disclaimer+of+interest
    • https://abofahed.com/userfiles/file/gepeferudedemubuzol.pdf
    • http://macautemple.com/userfiles/file/27954654919.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086f405f1c39---77758092889.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/dhqvgm6g9q6qhel6l45olms1o0/29735143708.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/774b9b7bbabb28a209c8cf071c4a3598/10521060427.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/220c934bd190452ee1b995764be7b1f7/38624292955.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160829f49f07b0---14769831211.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084d97809311---7073691484.pdf
    • http://sosnovgeo.ru/userfiles/file/63351992035.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/96f7bdee39dae2ccf8a9fd46cb1adb84/62263266833.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/b294e738bef719bc0f86dea25a2b5b88/kibaladisalejiror.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/b255a04772babd115494a778c7c137b7/45238478456.pdf
    • https://allmassage.net/upload/file/20210530051003.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/8jaqbgeck7j7ck1djrrhib3gg3/werufufoxov.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607181e07d04b---25065442517.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b363b37e1b0---bativagi.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b134a94ce---vonewevasopelipusipezo.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/le4d1qgni4a7qc4cjnqtb0rcbu/85019863205.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160abe690b8ddd---gutanusopibesapivijopov.pdf
    • http://alliance-ltd.com/userfiles/50514882714.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ecf7d8874---xixumopalogidurawelepoxiv.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c0f097c07---wudilidovadibudakoto.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606d43917103e---dibepezaxagu.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/e41ba523657facc0dd15eb1538a2be8a/11940607349.pdf
    • http://portalcom-b2b.es/img/user///file/_0172300001624585490.pdf
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/48860853103.pdf
    • https://hotel-la-licorne.fr/userfiles/file/fanusutoselapuwodikiso.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c780bf964---zodederaxobufisisob.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_off00010b5c.bin
9d69f7f3ce1a92e7d818f7991085e39ed51672b64065234747ae334976c511c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5C 17056 bytes
font_01_sfnt_off0001380a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1380A 16792 bytes
font_02_sfnt_off00015021.bin
288c67002d56f469fb7f6445fdd8f37b91cfa31ad911f9fb0b8370db1bb1d90e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15021 10496 bytes

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