PDF malware analysis — malicious · 9c8660c3e8f2f2d1

MALICIOUS

PDF

82.0 KB Created: 2021-10-06 01:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 8aebefff949222c731859b0462484b7c SHA-1: 8f4205d4f0958566e64577b70056d01c1c621dec SHA-256: 9c8660c3e8f2f2d1440b3e467442905504d93f4f271c17a8ab5de29074a71d84

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users. Heuristics and ML classification strongly suggest malicious intent, with ClamAV identifying it as a phishing trojan. The primary attack pattern involves directing users to potentially malicious external sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16158a5af9b58f---birudenaxugu.pdf In PDF document text
- http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efcea00c61---padazaxugotobuvuzix.pdfIn PDF document text
- https://intekcanada.com/ckfinder/userfiles/files/75785264753.pdfIn PDF document text
- https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/6646868000.pdfIn PDF document text
- http://dezmaster.com/userfiles/file/91920082114.pdfIn PDF document text
- http://petra-dario.info/upload/datoteke/vufutubi.pdfIn PDF document text
- https://luxurybaths.marblobaths.ph/app/webroot/img/files/3957789584.pdfIn PDF document text
- http://castudio.eu/userfiles/files/30351028555.pdfIn PDF document text
- https://rwd.webseo.tw/upload/files/noxinugizezabulumuw.pdfIn PDF document text
- http://www.extramas.com/userfiles/files/xukenaze.pdfIn PDF document text
- http://candybeauty.vn/upload/files/xabizubabebirozejegukaf.pdfIn PDF document text
- https://www.paseppe.gr/ckfinder/userfiles/files/57686970351.pdfIn PDF document text
- http://dobrejaja.com/Upload/file/95132959648.pdfIn PDF document text
- https://dolnoslaskialarmsmogowy.pl/imgturysta/files/12789974242.pdfIn PDF document text
- https://underworldgear.com/upload/users/files/93826698257.pdfIn PDF document text
- https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/58efdf394f3a0d5717d62f7fa1018632/7255847829.pdfIn PDF document text
- https://ccs-corporation.com/ckfinder/userfiles/files/boluzuxenuxulimojel.pdfIn PDF document text
- https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c59174593c---kikadorolikamuwutirerip.pdfIn PDF document text
- http://votava2.altrodesign.eu/ckfinder/userfiles/files/12295686039.pdfIn PDF document text
- http://hilimall.ae/uploads/files/70784769850.pdfIn PDF document text
- http://cross-winds.in/upload/contents/images/images/dixifisilovomalegafaneg.pdfIn PDF document text
- http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gabomezupo.pdfIn PDF document text
- https://verandapattaya.com/userfiles/files/vodomirolenudegopiguninos.pdfIn PDF document text
- http://keramann.ru/uploads/files/97323971143.pdfIn PDF document text
- http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615606c96914e---13114632984.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=act+a09+answersPDF 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_off0000d4af.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD4AF	10320 bytes
SHA-256: `f153cefa3965296e4140d7d4ecdfc04a15365ff2ad84fe0f269a78768ddd29dd`
`font_01_sfnt_off0000ec3d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC3D	20352 bytes
SHA-256: `075620f71d96f956db898b31ba6c191029f0b8eef91255d9fffc16fd909dd0c1`
`font_02_sfnt_off00012213.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12213	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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