PDF malware analysis — malicious · 1b822a7e45229e92

MALICIOUS

PDF

89.8 KB Created: 2021-07-23 11:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: aab04cb78fc21716dcaf34eb0a9700d8 SHA-1: d9894fba2d8687184b135ef7f7dd3688ceba0317 SHA-256: 1b822a7e45229e92dfbaf27df9b8f25f4d45dcc5103d32a324b3f4e6bf9d5902

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains a link farm pointing to multiple compromised websites and disposable hosting, likely intended to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns suggest a phishing or malware delivery scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9945

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 http://qiuyutv.com/userfiles/files/20210601054835.pdf In PDF document text
- http://englishplanet.info/ckfinder/userfiles/files/51558068853.pdfIn PDF document text
- http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160878b0b375fd---1545083798.pdfIn PDF document text
- http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607a260551637---nuvugixemekisoze.pdfIn PDF document text
- https://vishalahospitality.com/ckfinder/userfiles/files/xiliwiwililajajogaxid.pdfIn PDF document text
- https://adasms.fr/userfiles/file/52417231244.pdfIn PDF document text
- https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/622a19a806d84babdec628b9b0e41979/fisijajinevisurenubogem.pdfIn PDF document text
- https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/b158a210c11a16ae8d02768345060930/47481585552.pdfIn PDF document text
- https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/btb58nnnrrtlcdm84q5k5a4o35/wusaruruxet.pdfIn PDF document text
- http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fccee6cb60---vogakebesuvopatemire.pdfIn PDF document text
- http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/4ed01805339e79df431cda573d3bb9fb/76720731874.pdfIn PDF document text
- http://indagosrl.it/userfiles/files/vepakepavalupak.pdfIn PDF document text
- http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098395f82194---80850704150.pdfIn PDF document text
- https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/malonepipikokamilix.pdfIn PDF document text
- https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e015a71d7---67791558184.pdfIn PDF document text
- http://adria-ex.com/images/blog//file/72868077583.pdfIn PDF document text
- http://spc1962reunion.com/clients/c/c5/c535eb5d361035e84cedf1152ec4da8f/File/10539738542.pdfIn PDF document text
- https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16094533f3da1e---tiwizakajosad.pdfIn PDF document text
- https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/b460bc3dcd39209bc6c0daf83b717364/68016336713.pdfIn PDF document text
- https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6da25af666---warajoxomufesevefexa.pdfIn PDF document text
- http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/0pbhgsoiehj7ipscigactc98am/36949799167.pdfIn PDF document text
- http://botosani.ro/img/uploads/file/69992101542.pdfIn PDF document text
- https://kamarkosong.com/contents//files/16387941632.pdfIn PDF document text
- http://techhssilverbuffs.com/clients/61416/File/fexuxapegolupijusuvagem.pdfIn PDF document text
- http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d3e3666d7---62564142093.pdfIn PDF document text
- https://cape-electronics.com/media/file/palar.pdfIn PDF document text
- https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/59a895a118549118e686c85a1e7cedd5/taretufimitu.pdfIn PDF document text
- http://thedewakohchang.com/image/upload/File/5702695885.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=irs+1040a+form+2020PDF 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000fe39.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE39	16764 bytes
SHA-256: `e00a78fed4f742f5d9363d2a761c81c25f05dc688f121a3d26acd5f2b7801217`
`font_01_sfnt_off00012a09.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A09	10224 bytes
SHA-256: `a6ed4c5caf3bc6be8d2aff740649b739dac8d08fd7e2978a2765038b3e207f92`
`font_02_sfnt_off00014122.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14122	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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