PDF malware analysis — malicious · 82fea4c80e3bb8de

MALICIOUS

PDF

103.6 KB Created: 2021-07-23 11:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: eb3045dfef400cc07400971573022355 SHA-1: 738a134ea93cd71687c8b3adcaf99cdb3c08646a SHA-256: 82fea4c80e3bb8de0a79eba4887cd604b1b865ec083a17e09fbb815df7963e42

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the structure and numerous external links are indicative of a malicious document designed to lure users to external sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9868

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://chokysitohang.com/Uploads/userfiles/files/55283575205.pdf In PDF document text
- https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/cf112cffe03a94d855b383f63621fad2/40618830721.pdfIn PDF document text
- http://mtjjt.com/2013/upload/article/files/210702081245240172tek13.pdfIn PDF document text
- https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/0su8ngc1h6ie1j23i6vo9gnrg0/jovasumitugi.pdfIn PDF document text
- http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9365d8f392---616797573.pdfIn PDF document text
- https://zionapostolicministries.org/uploads/file/26660854612.pdfIn PDF document text
- https://abofahed.com/userfiles/file/2875366722.pdfIn PDF document text
- https://oumkua.com/userfiles/file/61799510090.pdfIn PDF document text
- https://vico-immobilien.com/ckfinder/userfiles/files/bafesovogizakexedazit.pdfIn PDF document text
- https://alajuusa.ee/media/contents/file/15355483938.pdfIn PDF document text
- http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c666b82caf0---27614598301.pdfIn PDF document text
- http://dragonera.cn/admin/userfiles/file/13342475327.pdfIn PDF document text
- https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/4e60d69acc73f555c71b4d899e9e726b/nuxiwepawevunux.pdfIn PDF document text
- https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160975e6194d0b---42070447236.pdfIn PDF document text
- http://yomamasushitogo.com/uploads/files/detodu.pdfIn PDF document text
- http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16073113f5e7be---fanuwebo.pdfIn PDF document text
- http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609f84dcb9552---35827875699.pdfIn PDF document text
- https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ece455390---145188060.pdfIn PDF document text
- https://btsmstlucia.com/atomicsteps/upload/userfiles/file/gurilokamekifik.pdfIn PDF document text
- https://alnahamgroup.com/userfiles/file/disowenukevavax.pdfIn PDF document text
- https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/de4rcp3t67osdcn15ufmtoj46m/55328278457.pdfIn PDF document text
- https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4c11601152fb367da37d87eee2ee13f1/ruwopudenok.pdfIn PDF document text
- https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/8c09fc58870b3986fea9a4ab63c64991/76973191224.pdfIn PDF document text
- http://quangphong.vn/uploads/image/files/texijajixezesarakax.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f375086715---29984441168.pdfIn PDF document text
- https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607335cf4e33d---8101951396.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=long+time+no+seePDF 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_off000124f6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x124F6	10100 bytes
SHA-256: `416af03261b21aab676d529ad3ec2ed4f9371bf061fd5d3bcc012013d904b3b1`
`font_01_sfnt_off00013b79.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13B79	2588 bytes
SHA-256: `79a616969853cabcac0405a5bb6b326d3890ac003b894a453e39a5d906d2076c`
`font_02_sfnt_off00014684.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14684	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00015e96.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15E96	19116 bytes
SHA-256: `edab2d77f731df32f33e1d5014b3174cb7d5310cb6d6d557f35231e57589baa0`

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