PDF malware analysis — malicious · 44ca69883f889fba

MALICIOUS

PDF

85.2 KB Created: 2021-09-10 14:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 4d057c30dbdf2b64ecf246982e27182a SHA-1: af0667491f09362546085ff90b3e007c10ed9483 SHA-256: 44ca69883f889fba6f97b1c38dd61bf411472dec872c3705fcea5f9b7a9ccfc5

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external links, many pointing to compromised CMS upload directories or disposable hosting, suggests a phishing or malware distribution scheme. The embedded JavaScript likely serves to obfuscate malicious actions or redirect the user to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://ketchas.ru/uplcv?utm_term=how+to+recover+deleted+files+from+gallery+vault PDF link annotation
- http://naturalwonders.com/uploads/files/19647775762.pdfIn PDF document text
- http://www.sctiec.com/up_files/FCK/file/84056217171.pdfIn PDF document text
- https://infosantiere.ro/userfiles/file/4662135345.pdfIn PDF document text
- http://thankschicken.com/uploads/files/59270073618.pdfIn PDF document text
- http://levotst.com/uploads/files/zabewesona.pdfIn PDF document text
- https://calson.garment-pro.com/ckfinder/userfiles/files/pedesos.pdfIn PDF document text
- http://goldsunjsc.com/upload/files/selukako.pdfIn PDF document text
- https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135456eb9920---2266966705.pdfIn PDF document text
- https://proektasis.gr/admin/spaw2/uploads/files/wazajedowufajujasakoka.pdfIn PDF document text
- http://tuzvedo.hu/elemek/file/rajirudo.pdfIn PDF document text
- http://e-photo.lv/ckfinder/userfiles/files/66792728695.pdfIn PDF document text
- http://alfavs.eu/userfiles/file/94692282803.pdfIn PDF document text
- http://studiobonvino.com/userfiles/files/32255263370.pdfIn PDF document text
- https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/35312740803.pdfIn PDF document text
- https://sistemagestiondpr.co/userfiles/file/tepiwowaxoboto.pdfIn PDF document text
- https://istanbularicilikfestivali.com/upload/ckfinder/files/gufuxixalamekeziz.pdfIn PDF document text
- http://goodfortune.hk/UpLoadFile/file///gufavo.pdfIn PDF document text
- http://americasbestwingsbeltsville.com/uploads/files/24747518761.pdfIn PDF document text
- https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137122fb59de---51632209178.pdfIn PDF document text
- https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336bebe0809---54240364833.pdfIn PDF document text
- http://baohanhranghm.com/upload/img/files/4078285671.pdfIn PDF document text
- http://szentistvanpatika.hu/upload/file/nuwavafawixoxogo.pdfIn PDF document text
- http://35ju.21tg.cn/uploadfile/ckeditor/files/daferotaweziz.pdfIn PDF document text
- http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/91090024166.pdfIn PDF document text
- https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/8842d9f6faf1f41622a2615278d48e49/jerela.pdfIn PDF document text
- http://thepducphat.com/upload/files/duzatimevimudajadikugalo.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://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_off0000e5c5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE5C5	11072 bytes
SHA-256: `b49c4ea6ff22584dc27454ed224693007ea055823b1c9a4fedd30b19eeb17d36`
`font_01_sfnt_off0000ff6d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF6D	18256 bytes
SHA-256: `81ba748591eda880076f05808304d89a097c2ed5b6014657ba85a07546d1233a`
`font_02_sfnt_off00012e64.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E64	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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