PDF malware analysis — malicious · 319e581dffb5606c

MALICIOUS

PDF

97.0 KB Created: 2021-07-05 19:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: ea803969ba85b35d1db5c044d888396a SHA-1: 867b377f07f04059ba963c20a6823a332f6e03fe SHA-256: 319e581dffb5606cc097a492443e942b49c274379af166374df9705d4c878dc2

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links to external PDF documents hosted on compromised websites, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification confirm the malicious nature of the file, likely serving as a downloader or redirector to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9421

Heuristics 7

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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 http://thecoferfamily.com/clients/7/78/7892d776c92a08c80f86ebc6236678d2/File/43170877918.pdf In PDF document text
- https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca9063f0e0---zuboxadutifuxap.pdfIn PDF document text
- http://barcabianca.eu/upload/file/nepidozazamedazerenaxiwow.pdfIn PDF document text
- http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/pebujebazuwolufuv.pdfIn PDF document text
- https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095816daeff6---fegolirukixajitizuwome.pdfIn PDF document text
- https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/d2ui2qlekpbm6fhe7r7067m7ah/72155890057.pdfIn PDF document text
- https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8cc9bc271---wadefer.pdfIn PDF document text
- http://innotack.com/userfiles/files/49082690425.pdfIn PDF document text
- http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fdf17bdbd---7627112629.pdfIn PDF document text
- https://area5srl.it/file/jatujexaj.pdfIn PDF document text
- https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c69a298357---28372820757.pdfIn PDF document text
- https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/92af022749a992a2959cde676b72476b/xisilawise.pdfIn PDF document text
- http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076caac86542---sajovedevokusud.pdfIn PDF document text
- https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/2f4087b3919480084aa83f4dc5f4c5b5/jedirurifumozepofotaxewip.pdfIn PDF document text
- http://studiospazioambiente.it/userfiles/files/5962976290.pdfIn PDF document text
- http://sancheonglittletheaters.com/upload/userfiles/2021/06/files/210629003600.pdfIn PDF document text
- http://andlupa.com/userfiles/file/juguvupi.pdfIn PDF document text
- https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160825e8ea33e9---jeramano.pdfIn PDF document text
- http://esthebel.de/userfiles/file/83955096874.pdfIn PDF document text
- https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/d5quqc39o1ks01l1b4o3p451tc/demulavebiriloze.pdfIn PDF document text
- https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bb79bc79323---53621325670.pdfIn PDF document text
- https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/52cf2da327d3cc1018d861f22813a91b/36818868860.pdfIn PDF document text
- https://blagoustroystvo24.ru/ckfinder/userfiles/files/sutofawutofopikezozedex.pdfIn PDF document text
- http://kbo.pl/ckfinder/userfiles/files/ledadije.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7022bf695---18212604824.pdfIn PDF document text
- http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2f05d8b7c---mesewukizelopaluwipid.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=camp+buddy+pc+free+downloadPDF 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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f901.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF901	1940 bytes
SHA-256: `21acba653c6fc240136b499e07d4eaa41b7086bbc86bae65605f023ea2ff856e`
`font_01_sfnt_off00010202.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10202	10896 bytes
SHA-256: `c604754992a968502f2f82228c61a3ea9c78c371552159a01a66d4359e0e7d91`
`font_02_sfnt_off00011b02.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B02	16132 bytes
SHA-256: `eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8`
`font_03_sfnt_off00013073.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13073	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_04_sfnt_off00014885.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14885	17160 bytes
SHA-256: `c8cdec8b9c34cad1fa210a2d76194cb2626b828e213c3d56d7b751ad5ec168e2`

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