PDF malware analysis — malicious · 2044732d3ce5f112

MALICIOUS

PDF

82.8 KB Created: 2021-09-02 23:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 01dc71cfd900a2978a94768f95940a9c SHA-1: 6ae1ccc95a3fa8f051c591eeecb55f807ec6872b SHA-256: 2044732d3ce5f1126af05f8ac99c5eebadca39652fb1d5366df222d4bc63527d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and the nature of the hosting suggest an attempt to obfuscate the ultimate destination and evade detection.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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 http://dakmoto.cz/obrazky/file/wedikulibajoraj.pdf In PDF document text
- http://bosch-service-center.ru/uploads/files/86057397596.pdfIn PDF document text
- http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/68415366674.pdfIn PDF document text
- http://cuacuonanbinh.com/userfiles/file/gajitifuzubofobuge.pdfIn PDF document text
- https://mamap.in/ci/userfiles/files/damaxemuvojinijuti.pdfIn PDF document text
- https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb1afaa78a---23819714996.pdfIn PDF document text
- https://iohrp.org/f_files/files/jesovuda.pdfIn PDF document text
- https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eabbb6f6da---9917355692.pdfIn PDF document text
- http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/a6d7c3a530861144f511413b8a7803a3/22332072502.pdfIn PDF document text
- http://shqinze.net/admin/upimg/file///56460450496.pdfIn PDF document text
- https://travelinnsuites.com/nbloom/fckuploads/file/91958911081.pdfIn PDF document text
- https://xn--lenachatka-57b.pl/uploaded/file/wugulakozipaf.pdfIn PDF document text
- https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/g99tq80ig76l9a4cjbl85q1b8f/xodoruforividuvojejoju.pdfIn PDF document text
- http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c1c7f647---6821436189.pdfIn PDF document text
- https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096027c716aa---50831399530.pdfIn PDF document text
- http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16115230da549e---49832297247.pdfIn PDF document text
- http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/93646095133.pdfIn PDF document text
- https://weddingitaly.jp/images/file/datuvoxasotivo.pdfIn PDF document text
- https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/43efbd2bdb0156886057de8aef66fc53/gamovegutujerarakax.pdfIn PDF document text
- http://ambulatorioveterinariomariani.it/userfiles/files/gubomesufazamobogizonopej.pdfIn PDF document text
- http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab8126e708---96150004719.pdfIn PDF document text
- http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a7679d13926---91133493734.pdfIn PDF document text
- https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/s7b8h00gc0q57j6sv891bi6ld2/82067918209.pdfIn PDF document text
- https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/4dptc1vrksqbnnbg6pjkkfs627/wotiv.pdfIn PDF document text
- https://biomedchita.ru/imeg_master/file/78875013227.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=baofeng+radio+manual+programmingPDF 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_off0000dd64.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD64	10728 bytes
SHA-256: `c5a7df695bcf5656caf858d18e163be6c5f2c0224821d1dade4f9b2a2552e7ef`
`font_01_sfnt_off0000f5c1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5C1	18280 bytes
SHA-256: `5bad54216b6610b9e3599d7d1da0a064cda96f088e19b950a38937f1c0157c1e`
`font_02_sfnt_off000124fc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x124FC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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