PDF malware analysis — malicious · 216460b2cd891628

MALICIOUS

PDF

92.8 KB Created: 2021-07-21 22:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 4693c820c4ea38de4ff6db20bb14261b SHA-1: 63c2f216eec112d9a00c7d0af813b2c5ff95b247 SHA-256: 216460b2cd891628c87787acded588765bd69aeeae937319af24b990a84f74d8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories and other potentially untrusted domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no clear textual lure but reinforcing the link-based attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9910

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://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/18123037544.pdf In PDF document text
- https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2e58a5ac3---genepasezibodoxodixupofex.pdfIn PDF document text
- https://srinivasagroup.com/ci/userfiles/files/mubejupakamuvunidul.pdfIn PDF document text
- http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e4b33e190---50836647090.pdfIn PDF document text
- https://avonsteel.com/UserFiles/file/41032191788.pdfIn PDF document text
- https://farmaciasacoor.com/site/upload/file/votedotobaburezexuziz.pdfIn PDF document text
- http://anvlaw.com/userfiles/file/tibezerojaku.pdfIn PDF document text
- http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc50b3708f---pepuvufuxoforaxedola.pdfIn PDF document text
- https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/da01128643504ebf7e2cb7d5c9d05d9e/sujowuz.pdfIn PDF document text
- https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/b954c1bc1af7354469a057e6b7ce8d6b/1376878403.pdfIn PDF document text
- http://www.chubsorn.com/file/files/bevazireterokag.pdfIn PDF document text
- http://files.ibiza-ferien.de/file/38950419487.pdfIn PDF document text
- https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a143c8e8d052874c827feaf2710d76c5/69001325674.pdfIn PDF document text
- https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba980e2c3a3---kajasatuxizotusuwomurise.pdfIn PDF document text
- http://vita24h.com/uploads/userfiles/file/40912647904.pdfIn PDF document text
- https://adikkeempat.com/contents//files/78240958263.pdfIn PDF document text
- https://ahl2005.com/ckfinder/userfiles/files/niniworepinoluvafa.pdfIn PDF document text
- http://jar-ted.pl/file/64288543858.pdfIn PDF document text
- https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/kovo8nge2vrtpn6agkpo085dcp/30729766221.pdfIn PDF document text
- https://toananhmedical.com/uploads/files/gefeluzelogovomiriwux.pdfIn PDF document text
- http://am-assets.com/aom/magnolia/userfiles/file/pukebinofotixivagurigu.pdfIn PDF document text
- http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16079bc5a6599b---54112723305.pdfIn PDF document text
- http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa54a5920d---98582598345.pdfIn PDF document text
- https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0182e873---kusozaz.pdfIn PDF document text
- http://drivescuolaguida.it/userfiles/files/tiwemutaderafupud.pdfIn PDF document text
- https://virtualpulse.eu/UserFiles/file/gilaja.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=populace+meaning+in+englishPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000eca7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECA7	19316 bytes
SHA-256: `4ad82cbed2f942a53658a67bf6e156acb494fe1ef3c458081fee29128efd739e`
`font_01_sfnt_off00011f10.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F10	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013727.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13727	10724 bytes
SHA-256: `8e7f80adaa3c4aec750241d5f8b8f1d29966ecb2e21ab603bae26174bc48e3b7`
`font_03_sfnt_off00014f92.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14F92	16060 bytes
SHA-256: `8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825`

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