PDF malware analysis — malicious · 690468e4db690d4e

MALICIOUS

PDF

69.1 KB Created: 2021-06-30 00:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 81339d845124ae0a9e4e9a4c6128a52f SHA-1: 96178538cdf25846ba7c778023589ff5a6304eb7 SHA-256: 690468e4db690d4ef8be9595c355b3c5d8324bbef47487d1ac3e56df52834e59

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external URIs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm on disposable hosting further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9993

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://drafthe.ru/uplcv?utm_term=furry+water+animals PDF link annotation
- http://php-lounge.de/userfiles/file/gorezitinemisaxarufozili.pdfIn PDF document text
- https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/a864f01d5bd406feb65f719062bfa55f/78247547783.pdfIn PDF document text
- https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/f3kl6cu59li7t0ib86ebemte65/67088834306.pdfIn PDF document text
- http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/zubefo.pdfIn PDF document text
- https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abc43ae36ec---97545382411.pdfIn PDF document text
- https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/39030d51b7dcc81055cffc06094e620f/xulunozumiviwave.pdfIn PDF document text
- http://garmagostaran.com/Upload/file/gitex.pdfIn PDF document text
- http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160873752a3f72---pokekiwukaxasadin.pdfIn PDF document text
- http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/kuaodbf104ta3nj2bvrbus3o04/88288407648.pdfIn PDF document text
- http://jshtextile.com/UserFiles/file///11770416052.pdfIn PDF document text
- https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//87502203107.pdfIn PDF document text
- https://gadd-asso.org/userfiles/file/befigodoke.pdfIn PDF document text
- https://szekszardportal.hu/userfiles/file/36594107698.pdfIn PDF document text
- https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759ac39cc39.pdfIn PDF document text
- https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/uqchrgibhj442s7v0n88m15bb0/robimivixutok.pdfIn PDF document text
- https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/623b4d24db54979e62aed332c0260c50/geralob.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_off0000b186.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB186	15156 bytes
SHA-256: `4f8700ad0e9d41054c04e7fbdb4f1afbc4201e713e661bf9de50489a3c5d7cdb`
`font_01_sfnt_off0000d849.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD849	10424 bytes
SHA-256: `4ea98486b1519a59b2fd66c52dd1eb1e3f5e8dbbaa3b727fe498db2776cc3e82`
`font_02_sfnt_off0000efee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFEE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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