PDF malware analysis — malicious · 09b137775b3944d1

MALICIOUS

PDF

81.2 KB Created: 2021-09-01 22:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: d569ed7baae850ca2661a069d3dd9b4b SHA-1: 0655beab4738328f37fdbff5f4151ee93c1db4cf SHA-256: 09b137775b3944d156f7b82bdb7b48b7bb8b2633adaca04a4692ecc19b44dac5

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and exhibiting characteristics of a link farm. The presence of embedded JavaScript, flagged by heuristics, suggests potential for malicious actions such as redirection or further payload delivery. ClamAV detection further supports the malicious classification.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://myarchitect.es/ckfinder/userfiles/files/kimitovato.pdf In PDF document text
- https://vicotelecom.vn/static/source/images/file/legunisotizodisusawom.pdfIn PDF document text
- https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/f65093d82bb45c5f2d073895efd5012e/mukonilineta.pdfIn PDF document text
- http://hotdeals24x7.com/ci/userfiles/files/fesijosu.pdfIn PDF document text
- https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160902f04673df---81324447973.pdfIn PDF document text
- http://pujcovnanaradi-tvarozna.cz/userfiles/files/79178400781.pdfIn PDF document text
- https://stijsr.com/userfiles/file/44406122870.pdfIn PDF document text
- https://oddluzanie.net/userfiles/file/dapivotudufomutol.pdfIn PDF document text
- http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6d01e6c6e8---megafet.pdfIn PDF document text
- http://fautographie.org/images/userfiles/files/63321841173.pdfIn PDF document text
- http://valdhans.cz/userfiles/file/9994895051.pdfIn PDF document text
- http://noidiengiaphat.com/upload/files/kamisuwejig.pdfIn PDF document text
- http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/makerof.pdfIn PDF document text
- https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/354eb4573179bdbde4da2d960223580b/jalobofanebagaforamofofid.pdfIn PDF document text
- https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/fcc7387b18d0a9642da1e02c27e353a6/lesokupavi.pdfIn PDF document text
- https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/7uq9la94jd3pnk8l0074o7trdv/nulurilerisebabanager.pdfIn PDF document text
- https://corumosmanlimakina.com/js/ckfinder/userfiles/files/19784812139.pdfIn PDF document text
- http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/vivojufewurulozofop.pdfIn PDF document text
- https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88217a9741---69336722583.pdfIn PDF document text
- http://biomehl.com/images/content/files/bivutabipowekapizilamo.pdfIn PDF document text
- https://office-agglo-larochelle.fr/userfiles/file/gidifegipenoranidinudowif.pdfIn PDF document text
- https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/08457f2c0a421fdd13d42e5fba9f3762/kasopufudepazumuba.pdfIn PDF document text
- http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092cfa9a51c9---6493169206.pdfIn PDF document text
- https://digireg.nz/upload/98975483979.pdfIn PDF document text
- http://weorderfood.com/uploads/files/zafonatemode.pdfIn PDF document text
- http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607841c297838---58377832385.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=which+best+describes+glaucomaPDF 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_off0000dc2c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC2C	10948 bytes
SHA-256: `a796dbcb5beaa840efe7890cfbbb7793eb971407fdd14bc5b9d81a6caad88c04`
`font_01_sfnt_off0000f55d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF55D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010d6f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D6F	16216 bytes
SHA-256: `51c665e90245faf2f2807279d152c03c8128cc02ee9944fa4140c25dba631875`

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