PDF malware analysis — malicious · 63328d2f031be32b

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 02:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: c930a65fea3600c34047d82d2ea0624d SHA-1: ecf737587d554fe5a3ff4e0c952ba7195338fa2c SHA-256: 63328d2f031be32bcebebd58bbdacc30325ca8deb19670060ae7be605a9e25b3

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9871

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 https://laborke.ru/uplcv?utm_term=motorola+usb+tethering PDF link annotation
- http://kcpsystem.com/userData/board/file/19656337635.pdfIn PDF document text
- https://ipekyolumedya.com/resim_galeri/file/22798854363.pdfIn PDF document text
- https://ashasuchikala.com/ckfinder/userfiles/files/wemij.pdfIn PDF document text
- http://thermcom.cz/userfiles/file/zeretowadot.pdfIn PDF document text
- https://apra.pl/files/file/8924802145.pdfIn PDF document text
- https://mexico-airport-transfers.com/ckfinder/userfiles/files/tezakezuwiz.pdfIn PDF document text
- http://www.fashiongale.ro/userfiles/files/42814927780.pdfIn PDF document text
- https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/103e9da10efb7f5b17efff20b166d5e9/bimozigedegileje.pdfIn PDF document text
- https://lodoshosting.com/calisma2/files/uploads/10973341099.pdfIn PDF document text
- https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/1b19536900b3d14a5d398f732bf13a10/3583296440.pdfIn PDF document text
- http://dealershop.es/userfiles/file/tinag.pdfIn PDF document text
- http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/27879922211.pdfIn PDF document text
- https://hotnews.md/upload/userfiles/files/66962171031.pdfIn PDF document text
- http://shepardinteriordesign.com/rw/upload/file/90330605476.pdfIn PDF document text
- https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/207d17a9435fe48613623a0955c4e418/soluxipa.pdfIn PDF document text
- http://confidenzacsapagy.hu/upload/18779954445.pdfIn PDF document text
- http://johnmarzillier.com/ckfinder/userfiles/files/58246093717.pdfIn PDF document text
- http://dlzj.net/upload/files/20210912180351534977.pdfIn PDF document text
- http://xecuoihuyhoang.com/uploads/userfiles/file/tugerubikawepexufi.pdfIn PDF document text
- https://merohamro.com/ckfinder/userfiles/files/96708209254.pdfIn PDF document text
- http://teamhead.net/userfiles/file/sufijunew.pdfIn PDF document text
- https://ms02bet.com/contents/files/wexazix.pdfIn PDF document text
- http://rubivina.com/Images_upload/files/53209005924.pdfIn PDF document text
- https://aquafilling.com/userfiles/file/dodaserixar.pdfIn PDF document text
- https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/64776796593.pdfIn PDF document text
- http://mtcnx.com/upload/fckimagesfile/linizerumidas.pdfIn PDF document text
- 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://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_off0000d916.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD916	10620 bytes
SHA-256: `f93e172b5a3c94fbd4b2e69878ffe3a020531ef899c656916e5b22f94e4b122b`
`font_01_sfnt_off0000f152.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF152	18016 bytes
SHA-256: `7495aeb02b24f8c0284ac2e9bbf5082c050f615241ba56f92df221c538e587a8`
`font_02_sfnt_off000120b5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x120B5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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