PDF malware analysis — malicious · 4e6880e16408240c

MALICIOUS

PDF

102.7 KB Created: 2021-07-04 02:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: a8bb0e6dfcb899cdcd7586de8177e54b SHA-1: 658c78dd42d12a8d7b4f88246aca42ef144e1418 SHA-256: 4e6880e16408240ce8a6a186452ca54189edbc3a01e44b746419342e863f855a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan distribution attempt. The document contains numerous embedded links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure strongly suggest an attempt to lure users to external sites for further compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9309

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://oniceh.ru/uplcv?utm_term=definition+of+eidetic+memory PDF link annotation
- http://precedent.by/_newsite/images_from_html_editor/file/texorubifezipifolemuv.pdfIn PDF document text
- http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7547b38f4---lowisufu.pdfIn PDF document text
- http://blesk-stroy.ru/userfiles/files/92361049861.pdfIn PDF document text
- https://anhhuynoithat.com/asset/files/dugoxarefizafib.pdfIn PDF document text
- https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/gubq33oq0plu1o2c2mde8fubr1/lowajaxalum.pdfIn PDF document text
- http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ed76857f819ca73b9bb9f44917eab369/sapukesasamejigoxe.pdfIn PDF document text
- http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a27fc65b483---tumibikonunaled.pdfIn PDF document text
- http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160b20da963439---72259904207.pdfIn PDF document text
- http://asckhn.com/acskhn/userfiles/file/dozibifoxumezu.pdfIn PDF document text
- http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac70d545fbd---17548360225.pdfIn PDF document text
- https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075839134607---544024112.pdfIn PDF document text
- http://kryotherapie.net/neu/userfiles/file/68818704100.pdfIn PDF document text
- http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091eabf20f16---35744199314.pdfIn PDF document text
- http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/adc271f980a5698cdfe2cd9d3b660d7d/tubibepuxapare.pdfIn PDF document text
- https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9d7936db2---64441257908.pdfIn PDF document text
- https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/a5aba51950dd62368f9691bd8ca0e875/85190070832.pdfIn PDF document text
- https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/c0dcf4cd5294bbe9be07ea064b80b07f/58973811182.pdfIn PDF document text
- https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/1957c9d366830871e667083315e677b5/jokuwitosunagem.pdfIn PDF document text
- http://hyundai-dongdo.vn/images/files/bowadojufubukovil.pdfIn PDF document text
- http://gk-eventus.ru/admin/ckfinder/userfiles/files/42846934525.pdfIn PDF document text
- https://mdteam.se/ckfinder/userfiles/files/xufuxanotezadosi.pdfIn PDF document text
- https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/gnb7qeg25e37pi79g2umi3moi5/29226360483.pdfIn PDF document text
- https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/97f3f042452ae32d5fbd7ed089934fe4/81780438220.pdfIn PDF document text
- http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d09d0ee55b0---35452367719.pdfIn PDF document text
- https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/2da6d40cfa076ccddfd2704151856a1f/xirezeji.pdfIn PDF document text
- http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/tngu0ogphenfv27gh635qk8lr4/3997391299.pdfIn PDF document text
- http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608f89fa10217---83598274519.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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ffb9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFB9	3008 bytes
SHA-256: `e7771cbda0c5e6ffa184e405ba8a78957cfdd0a0236690051f0c7c2f5658809f`
`font_01_sfnt_off00010c15.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C15	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012426.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12426	17500 bytes
SHA-256: `73708971c34ee7baa11c418d2df8b3c479ae2193056ddd2d8ca9f43685add0db`
`font_03_sfnt_off00013e63.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13E63	21116 bytes
SHA-256: `38ced3d3acb78262a35b1b0dc9a19e036cffdf92b07212ca7133a8ec80dddbbe`
`font_04_sfnt_off0001735a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1735A	10376 bytes
SHA-256: `3eff20541ec2c5239cee4ba7bba6348cd258195a32897605f5bd34b9893ac3f1`

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