PDF malware analysis — malicious · ffbdb566a798cd6c

MALICIOUS

PDF

72.3 KB Created: 2021-09-01 02:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 4c7e82166caba93756d0f0c5ec535ab6 SHA-1: 1f429ff4c5068b93040f2dd2cbaf9f859c837bc8 SHA-256: ffbdb566a798cd6c69528a7bd6837de2cbe9ab4e22b91aec8549bef504237181

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but confirming the use of wkhtmltopdf for generation.

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://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bdfa08cb51---tuvakixuxevogujo.pdf In PDF document text
- https://unitytradecapital.com/ckfinder/userfiles/files/tofagixamosowojulifa.pdfIn PDF document text
- http://batistar.fr/userfiles/file/58265687465.pdfIn PDF document text
- http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608668a39e3c1---20779274040.pdfIn PDF document text
- http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4170a3799f---kipunek.pdfIn PDF document text
- https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e26ae2d5cf5---vavawoxel.pdfIn PDF document text
- https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/jptdcguk393cu0d7hfc39iocg7/wimorataxij.pdfIn PDF document text
- http://marinda.ru/pics/images/file/dilivopapujabukive.pdfIn PDF document text
- https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/88595444768.pdfIn PDF document text
- https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dff91ff2687---41977044755.pdfIn PDF document text
- https://evergreencans.com/userfiles/file/448998336.pdfIn PDF document text
- http://thecoferfamily.com/clients/7/78/7892d776c92a08c80f86ebc6236678d2/File/69343000975.pdfIn PDF document text
- https://eseninternational.com/uploads/files/ripezasojupilupeja.pdfIn PDF document text
- https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/e48ae40d0c0a3588d9b1ef773f685786/35818407668.pdfIn PDF document text
- https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/5a491e06b1ed65a49eb24f9af9fc2f09/53874606619.pdfIn PDF document text
- http://pogservice.ru/userfiles/file/madikuwovuwivibagava.pdfIn PDF document text
- http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c2d13c77d8---37632276575.pdfIn PDF document text
- https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/e22da2e90fb1580eeb9a642a42a47a7f/74983214980.pdfIn PDF document text
- https://actor-conseil.com/files/file/78059630397.pdfIn PDF document text
- https://svingenieria.cl/userfiles/file/gefivare.pdfIn PDF document text
- http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b6c933f8c1---48834569889.pdfIn PDF document text
- http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/58299356037.pdfIn PDF document text
- http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8b6038a56---sumotepokolomag.pdfIn PDF document text
- http://ehomerealestate.org/images/file/titogojasasapip.pdfIn PDF document text
- http://2013.letnifestiwal.pl/ckfinder/userfiles/files/38075969223.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=2+syllable+words+examplesPDF 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_off0000ba3e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBA3E	10724 bytes
SHA-256: `7abab7471f8d88dca735193375c17c451e0ac15ad2573fd6078fc7b1d670d7cf`
`font_01_sfnt_off0000d2d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD2D5	16100 bytes
SHA-256: `d9b0d3ffcf3bde766661849177b75cc93a4804259361994d93d40e52530450c7`
`font_02_sfnt_off0000fbcc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBCC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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