PDF malware analysis — malicious · 809824cd6976c3d2

MALICIOUS

PDF

77.4 KB Created: 2021-09-05 16:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 9fdae524356d67c67b5e1e92215ad336 SHA-1: dd624f43700365f219295a38b4b0cd942ecfafa3 SHA-256: 809824cd6976c3d2dcd7df9243528cc5afdf5a5b2eb3aa341eecb8d3dbe6f2ed

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, indicating a deliberate attempt to hide its true purpose, which is likely to facilitate further compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://sealand-pptc.com/userfiles/file/75778428628.pdf In PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/082f5393dcf1af38beca85ed0ff97bcc/31240504925.pdfIn PDF document text
- https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4758e07924---80873303905.pdfIn PDF document text
- https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/jhccpvero8evln72t2950p85gm/zabilelilune.pdfIn PDF document text
- https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/vgsput0v5ss6jgvn8t2vm3oiik/96009246498.pdfIn PDF document text
- http://mea-travel.pl/userfiles/file/bekelupiwinajunuv.pdfIn PDF document text
- https://clubslotalmatriche.com/calcas/file/wokobexo.pdfIn PDF document text
- https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/372dafc4f7131a7cc8a031a4ebc57fd5/18026091135.pdfIn PDF document text
- https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607467d137902---pojiperezuvepinunovaxil.pdfIn PDF document text
- https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/9e2a77e365d8e4d77914c1f731c3399e/lariruvolewovudoranunedam.pdfIn PDF document text
- http://autodilykanka.cz/cmsimple/images/file/xewujifemegoderiz.pdfIn PDF document text
- https://aljazeerahpetroleum.ae/userfiles/files/1530524409.pdfIn PDF document text
- https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/446f6f6ff5d088a731acb547f04f7508/mewumuwofavekasanuwuxo.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bafb16a0d0b---mizovojo.pdfIn PDF document text
- http://austria-ex.com/images/blog//file/88397254947.pdfIn PDF document text
- http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16106dd2448e06---32763420116.pdfIn PDF document text
- http://architettodrabeni.it/userfiles/files/20755571347.pdfIn PDF document text
- http://slsnn.ru/content/file/nuxujixododota.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78592701d3---32176353298.pdfIn PDF document text
- http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9210d18ae---zebedugu.pdfIn PDF document text
- https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/7590622ca27e81a84dc8aaa39d9c8913/japivifejewolokogamiwa.pdfIn PDF document text
- http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba0fe0b110---fekawegesefiruveba.pdfIn PDF document text
- https://lotteppta.com/beta/assets/file/kataxokuwemaforanuj.pdfIn PDF document text
- https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608875bdf0245---rilafireliwamovemutage.pdfIn PDF document text
- http://luluscafeonline.com/uploads/files/10679382894.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=factory+five+mk4+assembly+manualPDF 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_off0000c71b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC71B	11064 bytes
SHA-256: `559d2b3de2eaba30afd34e522b1d382474d59f1752fa7d68ac14bc2e3c0a70a4`
`font_01_sfnt_off0000e0f7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0F7	18020 bytes
SHA-256: `061662e1b3a6f9c9b3fbdf8d00a47b38262de5be4b3d1567370d7b0b6192f567`
`font_02_sfnt_off00010f93.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F93	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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