PDF malware analysis — malicious · 1768b43c6f487237

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 20:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 8c3aad48d8395c275d25b1f990dfbcab SHA-1: d417858b7ab27c45b0e494e9938c65b9e2885e7b SHA-256: 1768b43c6f487237970d9887a725faaf1133fb58eaea19faa9205b1d7c24239a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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 https://chcial.ru/uplcv?utm_term=adhyatma+ramayana+pdf+english PDF link annotation
- http://rfychina.com/upfiles/files/16282762544269.pdfIn PDF document text
- https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722c2469877---21235916723.pdfIn PDF document text
- http://agapetown.net/ckfinder/userfiles/files/teverutufuvanugivenibilep.pdfIn PDF document text
- https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/7e8dfebf45d1c4539d67cae705d9b9ab/kavekope.pdfIn PDF document text
- https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/dazakiguxug.pdfIn PDF document text
- https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d13bdc88e---47664040957.pdfIn PDF document text
- https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/atuo6vmf707iov5lb0rn9r1ae6/80104665189.pdfIn PDF document text
- https://parfumzone.ro/files/file/4022849085.pdfIn PDF document text
- http://phongthuydotho.vn/upload/files/41092032034.pdfIn PDF document text
- http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf1da9fba6---togukujife.pdfIn PDF document text
- http://project-lovcen.me/userfiles/file/podudujifuze.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703745e8181---forevovijisun.pdfIn PDF document text
- https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/j8692445dmdu87iha36nticec4/babugelemodav.pdfIn PDF document text
- https://isosklo.cz./uploads/lowolari.pdfIn PDF document text
- http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb33718f26---39688065641.pdfIn PDF document text
- https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/csvtjlj5ds1mio9piprs1eb2h7/5699204854.pdfIn PDF document text
- http://creative-format.com/upload/editor/files/jobenokoxutafuz.pdfIn PDF document text
- https://bimstudioinc.com/media/files/jamakapadedorila.pdfIn PDF document text
- https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/b53f285a10cc1baca493653fc8c8513d/gizezekujax.pdfIn PDF document text
- http://diplomat2014.ru/ckfinder/userfiles/files/94414892587.pdfIn PDF document text
- http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607b362ecf6b3---nidaw.pdfIn PDF document text
- https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/ssb5bpi5ttfp7f4c4nae95i95q/vuvotiguw.pdfIn PDF document text
- https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/42df71f5c010c2c73c01a2cbc2ce5413/giwudukomutepuva.pdfIn PDF document text
- https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb5a1db02c---48832559013.pdfIn PDF document text
- http://citywideok.com/clients/75789/File/fobumesinamukumamelupegu.pdfIn PDF document text
- https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ef70439e7---zofizekinuf.pdfIn PDF document text
- 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dcae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDCAE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f4c5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4C5	10920 bytes
SHA-256: `51946ba91720899a080943bbdbf08bc896f8ac8c38b6ba89f7051b5de806e006`
`font_02_sfnt_off00010dac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10DAC	19684 bytes
SHA-256: `d10804e0c66640dc3ddc9e30aec68e205ad991bee2ca0ada1bb099cc4cc603b9`

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