PDF malware analysis — malicious · 4fabacb32d42344d

MALICIOUS

PDF

65.1 KB Created: 2021-09-29 02:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: ccac03780fac3bc97f03957d59aeb823 SHA-1: 9b872ffb76f9a1d07a837538b7218df093e22824 SHA-256: 4fabacb32d42344d918117d4c564d9d687d6a3298522a5b7bc7c325b41ba764d

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Several heuristics indicate the presence of external URIs and links pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to external sites. While no scripts were explicitly extracted, the PDF structure and heuristics strongly suggest a phishing or malware distribution vector.

Machine Learning

Nyx PDF Classifier malicious score 0.6188

Heuristics 5

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
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://gamecoast.by/uploads/files/58647264121.pdf In PDF document text
- http://akekaluck.com/ckfinder/userfiles/files/sebejuzowepafezokinoja.pdfIn PDF document text
- https://igraonica.me/userfiles/file/64947773335.pdfIn PDF document text
- https://crbz.ru/userfiles/file/95184693134.pdfIn PDF document text
- http://shinex-auto.com/userfiles/file/bulupelevojekuja.pdfIn PDF document text
- https://majubesar.org/contents/files/mazaguxumipatixilaxug.pdfIn PDF document text
- https://cupanghitam.com/contents/files/67481330002.pdfIn PDF document text
- http://talesma.com/E/file/44926519336.pdfIn PDF document text
- http://munnartourism.com/uploads/file/33806453397.pdfIn PDF document text
- https://faktxeber.com/resimler/files/64788690672.pdfIn PDF document text
- http://lpkgoodframeupvc.com/userfiles/files/tofipopusokebenepupusakid.pdfIn PDF document text
- http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/49465270020.pdfIn PDF document text
- https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161454b32ac4da---93516207843.pdfIn PDF document text
- http://tweddlefoto.com/files_contenidos/upload/files/noruranoruxomurakikokiro.pdfIn PDF document text
- https://ljlconst.com/admin/images/file/15665313221.pdfIn PDF document text
- http://zeci.nl/im/image/jelebekus.pdfIn PDF document text
- http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614641fb35334---374275081.pdfIn PDF document text
- http://franzoesischebulldoggen.eu/userfiles/file/45165808016.pdfIn PDF document text
- http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141e23d10617---61965315946.pdfIn PDF document text
- http://dulichtantai.com/files/uploaded/files/sikexibosatavojatekugom.pdfIn PDF document text
- https://www.almuhja.com/ckfinder/userfiles/files/zadetubabebi.pdfIn PDF document text
- https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613297dac9ddb---71176926636.pdfIn PDF document text
- https://krzczonowice.pl/gfx/file/86671025922.pdfIn PDF document text
- http://thechelseaff.com/user_uploads/files/98029955347.pdfIn PDF document text
- http://abpjseah.news-read.com/upload/files/tuvenamadusumupefuxubaze.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=x+plane+10+apk+all+planes+unlocked+downloadPDF link annotation
- 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_off0000b115.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB115	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000c92c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC92C	10676 bytes
SHA-256: `6a3497854df4fc118943409e021bae7fbcf77d53a523512f1c25f95a34fc31e6`
`font_02_sfnt_off0000e1d8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE1D8	16336 bytes
SHA-256: `61b9f787ac2c1e217981905c86e5e660f10c90364f8c38b81b58ac884c0c4c93`

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