PDF malware analysis — malicious · e3238c9f3ff4ee65

MALICIOUS

PDF

92.5 KB Created: 2021-07-04 04:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 136a1ec8ed59758ba5bcf555d39cf5c5 SHA-1: a60dc55b6aea1a380ffdfd7db7208e5350a02ebc SHA-256: e3238c9f3ff4ee65849ebf3d1baa929b7681d8e5481052cdcfc5ace6c4281f6f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The sample contains numerous links pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, indicating a focus on hiding its malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9746

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://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/26vb98tc3937crh8v8q1r79i3r/bexonirar.pdf In PDF document text
- http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/a7d57fabaa82bfcd2e30bebafa248e8c/86248999809.pdfIn PDF document text
- http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160811e96511e0---67078285615.pdfIn PDF document text
- https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607582899b723.pdfIn PDF document text
- https://bdcomunicazione.it/file/tekunugov.pdfIn PDF document text
- https://poolpoint.be/uploads/file/figemozusupamax.pdfIn PDF document text
- https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607424e80314e---88342994188.pdfIn PDF document text
- http://renknh.com/ckupload/files/36616458777.pdfIn PDF document text
- http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10a16b256c---buzusalimamarinu.pdfIn PDF document text
- http://hitecds.com/userfiles/file/tugawawudejajowepigonow.pdfIn PDF document text
- http://chizclean.ru/files/fck/file/bafikulagapakizam.pdfIn PDF document text
- https://longhoang.vn/upload/files/debegikovuvuxafabadovaxup.pdfIn PDF document text
- https://kudamatsu.org/userfiles/file/keselinobawudifelevirowu.pdfIn PDF document text
- https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/6cb42dbc4e96ed7db641d5c75cff7e8e/33109487574.pdfIn PDF document text
- https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/281996721ba079562c642587381fbd8c/96516160322.pdfIn PDF document text
- https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/sk0a5jptv5u2d44oknfksf0i9j/38202802491.pdfIn PDF document text
- http://promador.pl/userfiles/file/poforalovikuzapab.pdfIn PDF document text
- http://precedent.by/_newsite/images_from_html_editor/file/xixekoxajosuvugiwigazito.pdfIn PDF document text
- http://suvagcentr.ru/userfiles/files/kokijetaradixigaveka.pdfIn PDF document text
- https://xlspandoek.nl/userfiles/file/vesig.pdfIn PDF document text
- https://mannerfeltdesignteam.se/ckfinder/userfiles/files/83087811509.pdfIn PDF document text
- http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c36d2702e---6851058625.pdfIn PDF document text
- https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cd4a45f46---ragemowokesotidodivuxaxis.pdfIn PDF document text
- https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7ad9a5f3f---bamutewaj.pdfIn PDF document text
- http://yer-krasnodar.ru/ckfinder/userfiles/files/65419022184.pdfIn PDF document text
- http://vorne-sitzen.eu/pcms/content/file/5197370626.pdfIn PDF document text
- http://auchli-appenzeller.ch/userfiles/files/26130070472.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=kim+and+kroyPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f130.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF130	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010941.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10941	16164 bytes
SHA-256: `fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467`
`font_02_sfnt_off00011eb3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11EB3	18216 bytes
SHA-256: `b16ea9b5d2b383f308f7b0c958589e2cfdc30ea91385953b47628f2b19dd8d6a`
`font_03_sfnt_off00014dee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14DEE	10164 bytes
SHA-256: `1c4614b4fdaf6ec511580dd530e24b0cdcb4937f559caa76a17e2508bdb64a20`

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