PDF malware analysis — malicious · 813896534bcd00dc

MALICIOUS

PDF

90.0 KB Created: 2021-06-27 22:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 20d5024c820e413c403aeff14db1a787 SHA-1: 3018a0c8924cde6c0b882f4dedf839d64580b2e3 SHA-256: 813896534bcd00dcc9e490579761d60f5b71b2befd8aa88d3740e9078a4ed9cb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be non-readable content, further indicating a malicious intent rather than legitimate document content.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://garglob.ru/uplcv?utm_term=structural+elements+of+drama PDF link annotation
- http://www.odnpoznan.pl/fotki/file/file/savurafonunurolijexefupub.pdfIn PDF document text
- http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bdad297ef---18478898833.pdfIn PDF document text
- http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/199le30ooo5pjt37bj90pia920/35154438302.pdfIn PDF document text
- http://infunplastic.com/d/files/jelusuxipafenawezikebu.pdfIn PDF document text
- https://avenue102.com/uploads/file/72744193247.pdfIn PDF document text
- http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/5929de1078aab46642e9a97d1f1f3229/64710063065.pdfIn PDF document text
- http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd4e9e3f30---79376911627.pdfIn PDF document text
- http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076bf8e8dc0e---94878411550.pdfIn PDF document text
- https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/c5f4da58b576ec86cc6180ad3413104b/lemanivijipulutep.pdfIn PDF document text
- https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/2stuh7phqas1kq52d6qq328clg/88602682321.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c997dfbeb1c---xoloforetifu.pdfIn PDF document text
- https://codecs.ro/images/file/zitejarakorujunotobolos.pdfIn PDF document text
- https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/181ffee3454794479f35b922fd1b1350/89862405980.pdfIn PDF document text
- http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/48761351832.pdfIn PDF document text
- https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/ldkoggj1nj0al9f738ulmrtsfb/47678528685.pdfIn PDF document text
- https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/ef4340fc7d965714044a59f7f7e30fb8/87297017534.pdfIn PDF document text
- http://studiogiamberardino.it/userfiles/files/51427190885.pdfIn PDF document text
- https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607edf239c7e3---27647686981.pdfIn PDF document text
- https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b272c04584---17875968388.pdfIn PDF document text
- https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/6751654b35e833c1dcb8dbab0d39dbb4/38905446858.pdfIn PDF document text
- http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ea0c18707---68008648030.pdfIn PDF document text
- http://ash-graphy.com/userfiles/file/soputujakogokudine.pdfIn PDF document text
- https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/fdssr4f5da89qurg5hrjlraj1s/50622802968.pdfIn PDF document text
- http://xiaohecollege.com/d/files/72237147916.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_off0000fad1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFAD1	10720 bytes
SHA-256: `fed965088a4e52adc2ba6add9b2110e88ab1fab69f7910b10a857d28b7cdfee7`
`font_01_sfnt_off00011376.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11376	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012b88.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B88	18328 bytes
SHA-256: `ac45595424d476c44199024f5fcc4f81d94d8ed7570ebecd48a565a414ed9f2e`

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