PDF malware analysis — malicious · c8f5625f19978113

MALICIOUS

PDF

92.6 KB Created: 2021-07-18 10:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22

MD5: aef42206bebb680991908310f26b95af SHA-1: e00577395acc74b8c537e757186f0533654a032b SHA-256: c8f5625f19978113d910bc3d7f638eb6fa260ee91aa9ebbee9aa86bcd65e4976

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of phishing or malware distribution campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9924

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://walkandsmile.com/userfiles/file/77033419619.pdf In PDF document text
- https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092eb9a84a1d---6842416395.pdfIn PDF document text
- https://cissud.com/uploads/ck_editor/files/dokovikosexa.pdfIn PDF document text
- http://omonetach.pl/foto/ilustracje/file/46001120184.pdfIn PDF document text
- http://tizianaiberti.it/userfiles/files/bebuzoxaset.pdfIn PDF document text
- http://hopkinshigh1966.com/clients/1/10/1054c114374c88b4a165e91103565d41/File/xulubunanozilo.pdfIn PDF document text
- http://palami.by/images/file/28524684882.pdfIn PDF document text
- https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/jaipbl7krin54dudiip9kd0r00/zinimojopozejatimiduke.pdfIn PDF document text
- http://ayhancevik.com/images_upload/files/pedimifiwofutepon.pdfIn PDF document text
- https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/58927091df08608f6a0ee879ac096aa5/17427648343.pdfIn PDF document text
- http://goteneplast.se/files/images/file/13805703760.pdfIn PDF document text
- https://workinhotel.com/upload/fckfile/nabokedobenuniw.pdfIn PDF document text
- http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/52710d218c67bf8961e3083ac02b9b96/18434780843.pdfIn PDF document text
- http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072973be1fac---17669337295.pdfIn PDF document text
- https://handientu.vn/userfiles/file/8897543201.pdfIn PDF document text
- http://campcolefamilyreunion.com/clients/82065/File/zunisovuni.pdfIn PDF document text
- http://oilandgaswork.com/userfiles/file/rugujoziwejuripitojowagi.pdfIn PDF document text
- http://chieusangducphat.com/uploads/userfiles/file/mokenetadenusogebut.pdfIn PDF document text
- https://edebmachine.com/images/media/files/12745572833.pdfIn PDF document text
- https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/d424o5f93m32ik0t1kr7u5emu1/22932603131.pdfIn PDF document text
- https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce5a045544---mokekal.pdfIn PDF document text
- https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/e1abd9d2ba2db9da93395164828fbbf3/rinanutajufogafim.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/bige3uo225l7bbvamke3sgj8om/62464224534.pdfIn PDF document text
- http://gyogytornasziget.hu/uploads/files/1468368475.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=lehman+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
`stream_004_off00011ac4.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x11AC4	28632 bytes
SHA-256: `80aa11f7b2c8610ecb9b4d395e468e54f09500147c010bfd7af608054e10f619`
`font_00_sfnt_off0000d390.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD390	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000eba2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBA2	18008 bytes
SHA-256: `2454f518255db9b97e2ecf72fb9b4fe8d3ff52f3ae7cc29a6002d0ca396a0d99`
`font_03_sfnt_off00014ded.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14DED	10196 bytes
SHA-256: `05506637b77ea0819230887393dfb24988294270b3d75f3f29894e1c8852d502`

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