PDF malware analysis — malicious · c6e7516cca1c1dc2

MALICIOUS

PDF

88.6 KB Created: 2021-08-23 11:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: a0399c344eca3b6ad969e7185e4675e6 SHA-1: ac1e4c390f381fe6a8deaa3e7bc7bc52e20a7ad1 SHA-256: c6e7516cca1c1dc2bb9d454985ee04bc7601e5525e508b98fbed07a77d3dfc16

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous external URLs, many of which point to compromised WordPress upload directories. The ML classifier strongly indicated maliciousness, and the presence of multiple links to potentially malicious or compromised sites suggests an attempt to redirect users to malicious content or phishing pages. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

Nyx PDF Classifier malicious score 0.9919

Heuristics 5

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://mobilieroccasion.fr/uploads/file/81264403295.pdf In PDF document text
- https://nhaccugiare24h.com/uploads/userfiles/file/51984721365.pdfIn PDF document text
- https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/ff1e7381a58f1948606b53bdacf21346/wudisutuwuwifiwomi.pdfIn PDF document text
- http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/c543273c6486906015c23a1cf46834e2/zukowovabivusudemukagu.pdfIn PDF document text
- http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3242b0da8a6787b52e3406908f8e6fae/35992391177.pdfIn PDF document text
- http://vakaruinzinerija.lt/userfiles/file/461748238.pdfIn PDF document text
- https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/f28h0e45etvodb4nk4strs4dus/xijelisomi.pdfIn PDF document text
- http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091c38c9c0f2---95745142502.pdfIn PDF document text
- https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/e0f770c182928ef06ceb74ea301445d1/67339713397.pdfIn PDF document text
- https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2cbb566d15---takavasotinulapabel.pdfIn PDF document text
- http://zerosquareonline.com/file/mumog.pdfIn PDF document text
- https://mcdelandes.ca/uploads/file/22194743984.pdfIn PDF document text
- http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/lmrlim6d1lnicb3dh3hvbfm2n1/16334449948.pdfIn PDF document text
- http://megalabsrl.it/userfiles/files/bobemutifazixasozitoz.pdfIn PDF document text
- http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/wakumowudamijidasali.pdfIn PDF document text
- http://qamsar.org/userfiles/files/vevigaro.pdfIn PDF document text
- https://betalinktech.com/blmedia/file/kibexovolobibikadi.pdfIn PDF document text
- http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c394f63599---4478192238.pdfIn PDF document text
- https://gkia.org/kingkong/userfiles/files/94922716551.pdfIn PDF document text
- https://travelinnsuites.com/nbloom/fckuploads/file/35793499112.pdfIn PDF document text
- https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/3fkneilhs18lqmg1qaqn7ih5i7/6545659387.pdfIn PDF document text
- https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c149ec447f8---82051499748.pdfIn PDF document text
- http://apartmaji-zunicmile.com/uporabnik/file/6185391519.pdfIn PDF document text
- https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/bs7dff89u1e4qsnll696ls1vbs/62883032861.pdfIn PDF document text
- http://bolshunoff.ru/images/wysiwyg/file/43487450521.pdfIn PDF document text
- https://alixdemassy.fr/userfiles/file/pikogawujepobojiwofumu.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=real+valued+function+definitionPDF 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_off0000f72a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF72A	17208 bytes
SHA-256: `cba4200aa174b6e7e417384d31e0aaf085c372703dee62e0b8410cd530ead777`
`font_01_sfnt_off000123d7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x123D7	10412 bytes
SHA-256: `cae3463be1082c828798cba99d34be2c0dfbb73424fd7d9cd7c181b34a03d200`
`font_02_sfnt_off00013b8d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13B8D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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