PDF malware analysis — malicious · 892d78769f4cedd6

MALICIOUS

PDF

76.0 KB Created: 2021-09-08 00:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 5dc16bf583bda63268349bef3fdc9826 SHA-1: 8d27e23a90dcf21f371c29f270f7bbe74d4e3e00 SHA-256: 892d78769f4cedd6a02171d576de8b8fb40e19a77ff151ef171001e409349f39

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to external PDF files hosted on various domains, many of which appear to be disposable or compromised CMS uploads. The presence of these links suggests an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://orangerun.re/photo/files/27212372084.pdf In PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073446a63923---ruvijuxemokubepoj.pdfIn PDF document text
- https://umartravel.com/files/73959673346.pdfIn PDF document text
- https://ecoverservice.be/gallery/file/kusor.pdfIn PDF document text
- http://barcelonasixtytwo.com/userfiles/file/5826249611.pdfIn PDF document text
- https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/65380bb5ef0785ba9fdb835cdbc60de6/29064552066.pdfIn PDF document text
- https://es21sys.com/userfiles/file/16807722639.pdfIn PDF document text
- http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075fd8032d4d---fepugid.pdfIn PDF document text
- https://ms1oke.com/contents/files/boxigujo.pdfIn PDF document text
- https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d1b71d03a---pojapenobukaguk.pdfIn PDF document text
- http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa35a9a4d2---2171346613.pdfIn PDF document text
- https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/386f1759f5b331b48ae6b8292b0a7cb1/bozanejupomewesasatogix.pdfIn PDF document text
- http://bebelino.ru/userfiles/file/xidigolidenakotam.pdfIn PDF document text
- http://viral-list-monster.com/ckfinder/userfiles/publics/files/24427453566.pdfIn PDF document text
- http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/506ro1e4mhvu21cs7ga847ose0/wedarozulu.pdfIn PDF document text
- http://sevinctekstil.com/resimler/files/28084814635.pdfIn PDF document text
- http://vce34.ru/attachments/file/1947312505.pdfIn PDF document text
- http://rajskiewakacje.pl/userfiles/file/73592788213.pdfIn PDF document text
- https://dreptultau.hotnews.md/upload/userfiles/files/50647903619.pdfIn PDF document text
- http://debsecond.net/UserFiles/File/46514149074.pdfIn PDF document text
- https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/0f5aede3ba43ec1840b6a583259b56c5/tegosokunuguxu.pdfIn PDF document text
- http://logtech.cz/foto/Image/file/74236186448.pdfIn PDF document text
- http://xenangheli.vn/public/files/dodulamiguvoxejodore.pdfIn PDF document text
- https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/35143889560.pdfIn PDF document text
- https://vigiweb.cl/dinamicos/files/file/37631421301.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=manual+muscle+test+sternocleidomastoidPDF 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_off0000c582.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC582	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dd94.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD94	17208 bytes
SHA-256: `1096e70793bc490770b53c5d79e86ab6cd3d47ae83571bb8954a2cebf47ab665`
`font_02_sfnt_off000109c1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109C1	10624 bytes
SHA-256: `b03d02268c212604af9498623c00d98ab8dfedda463c421ec438037d6535e9a3`

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