PDF malware analysis — malicious · 4b302f6a0bc8e382

MALICIOUS

PDF

89.0 KB Created: 2021-07-03 09:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 545fd55969bfc1f735a34ace638bc252 SHA-1: bcef740e045aae92fe8ec9274c355703b9f19fb9 SHA-256: 4b302f6a0bc8e38208a67d58170afc147bde8aca1b25990bc9d995d21fcf38c7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to distribute phishing content or further malware. The presence of external URIs and link farms suggests an attempt to redirect users to malicious destinations.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://pistant.ru/uplcv?utm_term=repetition+in+design PDF link annotation
- https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/ecfb7e75080eb9cbd41d23ea72d77be8/82424711429.pdfIn PDF document text
- https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073b96102ee2---xizename.pdfIn PDF document text
- https://zoorichi.com/temp/fckeditor/file/nenukilon.pdfIn PDF document text
- https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2259f49a0b---najutonikowetebesawabe.pdfIn PDF document text
- http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2dd008f45---95871622793.pdfIn PDF document text
- http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b11496169f6---konebumofidijezaj.pdfIn PDF document text
- https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bba214c2d3---68389346176.pdfIn PDF document text
- http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc422270df---59503056219.pdfIn PDF document text
- https://radmangroup-ye.com/rgfiles/file/89680795037.pdfIn PDF document text
- https://24emk.ru/ckfinder/userfiles/files/44731134138.pdfIn PDF document text
- https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/e01b7a0a98dad4829fec68928a0a2dd8/51700630974.pdfIn PDF document text
- https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607caf9d57a56---wofifukuvebekoped.pdfIn PDF document text
- https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/kodadudiwiwuzibala.pdfIn PDF document text
- https://amd-export.com/site/upload/file/dizanapawaduzesarenajigo.pdfIn PDF document text
- https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/8694e0329d77838507431231021028a1/1999167569.pdfIn PDF document text
- https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/576f6ebc7bbb5161bcb27348dfdc43d2/sufebixo.pdfIn PDF document text
- https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/1fuj50pv6q8fqstqkqui83inlb/77310313237.pdfIn PDF document text
- http://arcenevents.nl/site/upload/files/xebufanorudukat.pdfIn PDF document text
- http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecefcf16b4---rukijoru.pdfIn PDF document text
- https://actor-conseil.com/files/file/jewuwikatitoresin.pdfIn PDF document text
- https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607892be6ca5c---likatojavuvuxujezato.pdfIn PDF document text
- http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fcb1efab8---55934160556.pdfIn PDF document text
- http://gdwtechnology.com/fckeditor/file/likodatevevewa.pdfIn PDF document text
- http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96ec92fc8a---jiwadogadibamemakam.pdfIn PDF document text
- https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/5q8t7dmthmacqoh25imal9asj7/depusirotefozut.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_off0000fa33.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA33	10304 bytes
SHA-256: `d4ec335a9fca61e8c11efbd5b0810ae3efa6c4e56084b566186357b895733d3b`
`font_01_sfnt_off00011151.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11151	16868 bytes
SHA-256: `6008705d40f0726244c1275b0bb1589320948ef35f3e46a4baee61546350945b`
`font_02_sfnt_off00013d59.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13D59	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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