PDF malware analysis — malicious · f7433c66f1fe70b2

MALICIOUS

PDF

84.4 KB Created: 2021-09-05 14:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: e341e2cfbd351534a9a755d5d8914e77 SHA-1: ab4f4875b4c09394f2341cfd959bb4b6338a0073 SHA-256: f7433c66f1fe70b2e19d46abd05109eab84ce0ae78c11f987271c3e270187717

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous external URLs, many of which point to compromised CMS upload directories or are part of link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates the file's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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 https://oniceh.ru/uplcv?utm_term=major+themes+in+african+literature+pdf PDF link annotation
- http://agnieszkapawlik.com/userfiles/file/mafaraduguten.pdfIn PDF document text
- http://petukmahaaaraj.com/userfiles/file/kuxubonirak.pdfIn PDF document text
- https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912224d66de---gemiponaxabi.pdfIn PDF document text
- https://mclandpin.com/calisma2/files/uploads/9804413397.pdfIn PDF document text
- http://toyotacri.com/userfiles/files/jedodozata.pdfIn PDF document text
- http://abwlondonblvd.com/uploads/files/lilutugeturu.pdfIn PDF document text
- http://harchovyk.com/userfiles/file/dibivivisu.pdfIn PDF document text
- http://wpchkg.com/upload/image/file/83023431258.pdfIn PDF document text
- https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/2a215bdf877172b7cd89070cdf9bdca7/zonumukajuzezan.pdfIn PDF document text
- http://nedirajtebosnu.net/userfiles/file/23318888969.pdfIn PDF document text
- http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e884c3c1c---77146562862.pdfIn PDF document text
- http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4634f7af30---25953611937.pdfIn PDF document text
- http://bladensburg.abwingsmd.com/uploads/files/konozatitejusi.pdfIn PDF document text
- http://afgventuregroup.com/cfiles/file/malanumop.pdfIn PDF document text
- http://aelma.com/sites/default/userfiles/file/favotumi.pdfIn PDF document text
- http://rafaelokazakov.com/file/5622813343.pdfIn PDF document text
- https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/9c3796f0f4b1ac844e2c69a5f6009696/17094232778.pdfIn PDF document text
- http://adice-area.com/pictures/files/63949717307.pdfIn PDF document text
- https://bucatariizidite.ro/printuri-fi/files/borebolokud.pdfIn PDF document text
- http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112f4675475c---55646279444.pdfIn PDF document text
- https://fizjolech.pl/userfiles/file/buboxujokivelelukab.pdfIn PDF document text
- https://drakbera.com/ckeditor/ckfinder/userfiles/files/seroriwopimugikososawi.pdfIn PDF document text
- https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/35c056e54a272f99eba3c185891b91b4/fejesikulazewuserituwen.pdfIn PDF document text
- https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/441a4e326706b3d13e64f083184df530/2334605422.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_off0000df69.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF69	19624 bytes
SHA-256: `773fab3e8a0de4cb2ee5a46e2d3427bfc67ce0516eea86db03772f35e465be5f`
`font_01_sfnt_off000111fd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x111FD	11108 bytes
SHA-256: `b9b557b33a2aab2f3e94465e9476e148b0b051a0fae3e800d051b8a8f10d5762`
`font_02_sfnt_off00012bae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12BAE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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