PDF malware analysis — malicious · a3ffe2d21754b85d

MALICIOUS

PDF

88.6 KB Created: 2021-07-02 22:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 49a3eb8831cda12b26d386b9689c9051 SHA-1: a6e127c0831cc8d11a4ac58ad2aed37fbf7ffc94 SHA-256: a3ffe2d21754b85daa4cb761b9e81976f3370d1024045b9e95a09fb63d81d9ad

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability or contains malicious content. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The presence of external URIs and a link farm structure points towards an attempt to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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 http://creativetechno.in/userfiles/file/47440670788.pdf In PDF document text
- http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/n6oqhlbcl9uk5ppl9dqeon00t7/51719755064.pdfIn PDF document text
- http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/69237842682.pdfIn PDF document text
- http://septumdent.com/img/userfiles/files/6391451597.pdfIn PDF document text
- https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/5763c8988fb84b0b18b293599f6e0080/lofarenimakopasir.pdfIn PDF document text
- https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcc11b091f---musoparimepovujitogak.pdfIn PDF document text
- http://tfwdynasty.com/clients/f/fc/fc55782506b94f933057639757072b2a/File/1261721870.pdfIn PDF document text
- https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079335567745---34519983373.pdfIn PDF document text
- http://cuadepthanglong.com/images/ckeditor/files/38295762749.pdfIn PDF document text
- http://dabaizhongxue.com/upload_fck/file/2021-6-19/20210619144440399420.pdfIn PDF document text
- https://dolcezzecaffe.it/file/voritufuse.pdfIn PDF document text
- http://chandigarhdatarecovery.com/files/file/53169207192.pdfIn PDF document text
- https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/6c610d382d68a2c563fe5ea6757ba00d/gijigudedoroteduvag.pdfIn PDF document text
- http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607490bac5ec3---niwaxejivodubo.pdfIn PDF document text
- http://accessprecision.com/userfiles/file/69361207121.pdfIn PDF document text
- https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/e0e37887b6686348f8c994417fc6c5a7/nakefiz.pdfIn PDF document text
- https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/efa94276547c49e0f602176ed49e9cb6/21236298713.pdfIn PDF document text
- https://journeywithmypet.com/ckfinder/userfiles/files/1546132058.pdfIn PDF document text
- https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b29486f9d---vifixelofivowibafuwugoju.pdfIn PDF document text
- https://roc.mn/uploads/files/93764779498.pdfIn PDF document text
- https://martabaktelor.com/contents//files/8248640964.pdfIn PDF document text
- http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f404958e1---woxefopalixirami.pdfIn PDF document text
- https://biothiennam.com/media/ftp/file/renevusudizelelolewufe.pdfIn PDF document text
- https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/350qgl09airmnugmlgup27vnl0/bafetugurikumaxi.pdfIn PDF document text
- https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/264df6864e45284becda7515e2f84237/8644978756.pdfIn PDF document text
- https://gikguamerica.com/userfiles/file/33802555271.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=washing+synthetic+down+jacketPDF 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_off0000f567.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF567	17804 bytes
SHA-256: `06597b1746c4f882faea1e17eaa30ee3b1bbaaf8f9a42c8d4d014efe22ce0331`
`font_01_sfnt_off000123a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x123A0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013bb7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13BB7	10920 bytes
SHA-256: `01b528bf25408fe931d9ad1eef06b2bbe53a1cd7291c51964f77d522cec9914a`

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