PDF malware analysis — malicious · 4571f9a79647a5a8

MALICIOUS

PDF

80.3 KB Created: 2021-09-03 03:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 6e1f7ec9d9ff2da6699f26eb1962c635 SHA-1: 8f175b08217d59bc1fb37035c81e2d5f99231947 SHA-256: 4571f9a79647a5a82c7ab5ac9ea56106b5557c923b34506d3e6ced2513774f14

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm used for phishing or malware distribution. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent. The embedded URLs and link farm structure point towards an attempt to redirect users to malicious content, likely a phishing page or a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=scanned+pdf+converter+to+excel+free+download PDF link annotation
- https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/2rqhftrju3mlfvkdgrqptjmlve/momalijobuwudederuxeti.pdfIn PDF document text
- http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075389c5c00b---79707429885.pdfIn PDF document text
- https://protectname.xyz/whoisprivacy/userfiles/files/fonikesefebozupaladarowi.pdfIn PDF document text
- https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0cee52f70---88103113425.pdfIn PDF document text
- https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/2344df1595be7ff9b6cad80ee8056f2e/fagituvuroxoxuruxipofemi.pdfIn PDF document text
- http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d356547d688---xesawel.pdfIn PDF document text
- https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/f1b4a27132e4a2148b1f84f2e8d98572/40372656552.pdfIn PDF document text
- http://mai-colle.jp/userfiles/file/minebazonip.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f7f377954a---ruzumesupixuxaxukuviliji.pdfIn PDF document text
- https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/059d6ac13bd4f1a766156a09ad599780/milidatipibi.pdfIn PDF document text
- https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1d0b2b181---92842095730.pdfIn PDF document text
- http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/61346293b6a0f6626d06dd59beb655df/lulug.pdfIn PDF document text
- http://paletydozahrady.cz/ckfinder/userfiles/files/56095181153.pdfIn PDF document text
- http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1ada76491---28689401162.pdfIn PDF document text
- http://mjsolankifoundation.com/fck/imagesfile/58940085891.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f87edca3e6---97908067789.pdfIn PDF document text
- http://apisicul.com/userfiles/files/wiloxidosak.pdfIn PDF document text
- https://dailyiat.com/html_upload/file/wusogaxokes.pdfIn PDF document text
- http://crocepadrekolbe.it/userfiles/files/5395581760.pdfIn PDF document text
- http://zuche0551.com/upload/file/17436046502.pdfIn PDF document text
- https://zapret-rf.org/web/img/podborky/files/89818395157.pdfIn PDF document text
- http://statsale.com/data/upload/ck/files/wigijumajinerojefoxa.pdfIn PDF document text
- https://floridainvestment.cz/files/file/netelogapebekonot.pdfIn PDF document text
- http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f286cad80---mezup.pdfIn PDF document text
- http://bdnchem.com/upload/files/66230216664.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_off0000d429.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD429	17960 bytes
SHA-256: `894ed9d195b5319d47b8b29f0cae3631cea2e332d8c461a251fc3ebf21dcf2c3`
`font_01_sfnt_off0001021e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1021E	10680 bytes
SHA-256: `ebba0657f256fe603383f92fd9d813ac5bc50c3b9128ed0fdaa5b09b71f2c82d`
`font_02_sfnt_off00011ad8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11AD8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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