PDF malware analysis — malicious · 4ec49d421dc0062c

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 05:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 7b37efd1f7e8219e1294a17e2f4d69eb SHA-1: 5486f0560d2aaf82ba7aa0804522754a34836f1a SHA-256: 4ec49d421dc0062cb198f4bd799e1d3489307aa35f412871bd77d873f8236986

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL patterns are sufficient to infer a malicious link-based attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

Heuristics 6

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.
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://jagatjyotischool.org/jagatjyotischool/userfiles/file/80290861318.pdf In PDF document text
- http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865b20d5277---zatuwetadunedivodazav.pdfIn PDF document text
- http://saluteebenesseresas.it/userfiles/files/kuwevaweladedati.pdfIn PDF document text
- http://primebrokeragetx.com/ckfinder/userfiles/files/11469165869.pdfIn PDF document text
- https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e8b702c3c---24587630111.pdfIn PDF document text
- https://pmfegypt.com/userfiles/files/84753557799.pdfIn PDF document text
- https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/rb1rqu7k3in3umt3us5gqp1d68/32464967170.pdfIn PDF document text
- https://satbietthu.com/luutru/files/43971254809.pdfIn PDF document text
- https://rugsinc.in/UserFiles/files/mazoman.pdfIn PDF document text
- http://elite-weekend.com/clients/9/94/945a7f92a07ecc721aac768ad340748a/File/81170286320.pdfIn PDF document text
- https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606faba91a613---19318001279.pdfIn PDF document text
- http://bestbuyfromindia.com/userfiles/file/97722571790.pdfIn PDF document text
- https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca8e986d07---43773704771.pdfIn PDF document text
- https://acavacecio.it/userfiles/files/palixevi.pdfIn PDF document text
- http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c23a0ccd963---venotudu.pdfIn PDF document text
- https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/191b82b520066c371e280e392aa62f15/lugexixonorupexilof.pdfIn PDF document text
- https://raljob.com/userfiles/file/89842079865.pdfIn PDF document text
- https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/n5ujbpn5d97qq59gebls55gih3/55205112737.pdfIn PDF document text
- https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adb00b17620---xuzipifanelumumubid.pdfIn PDF document text
- https://www.fangjin.org/ckfinder/userfiles/files/56291273203.pdfIn PDF document text
- http://benetalent.com/upload/files/26522187878.pdfIn PDF document text
- http://smartvoicecom.com/userfiles/fajen.pdfIn PDF document text
- https://fizjolech.pl/userfiles/file/gawamuv.pdfIn PDF document text
- http://thicongdiennuocmiennam.com/uploads/files/defefatokelixi.pdfIn PDF document text
- https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceb2ec8ee7---diboxoju.pdfIn PDF document text
- https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/0b5fbf6ecf5159ca614fa18e77083830/polusigetotuxopir.pdfIn PDF document text
- https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/fdac1f7b9f58b380dde4a8aa8c5a9717/10934913892.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=pengertian+fakta+sejarah+pdfPDF 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_off0000d9a9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD9A9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f1bb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1BB	16572 bytes
SHA-256: `8e243eb1189c6fb4543e3dc14aa79c7e31f222810e1e2c245851246b476fb65c`
`font_02_sfnt_off00011c4f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C4F	10832 bytes
SHA-256: `e0c5df06da72f21f4617285e774cc6099d99c9b3da50a4c45b19d3367f224845`

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