PDF malware analysis — malicious · da1cd8bfb080521e

MALICIOUS

PDF

90.4 KB Created: 2021-09-01 08:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: c224a318d1fecb10f972ffbe4b5d650c SHA-1: 80777d4900f575177d4f046aec23d91bc68099fc SHA-256: da1cd8bfb080521e38d8579c37ac333f71474b92b88d8a4a6228cfb9faac2cb3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

Nyx PDF Classifier malicious score 0.9985

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://farashimirooz.com/files/10695750128.pdf In PDF document text
- http://www.dfdtrading.sk/ckfinder/userfiles/files/majapamerivesivos.pdfIn PDF document text
- http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/63372655419.pdfIn PDF document text
- http://ekachaiguitarist.com/ckfinder/userfiles/files/77452873593.pdfIn PDF document text
- http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/50738572039.pdfIn PDF document text
- https://cabsfromheathrow.com/userfiles/file/20019524808.pdfIn PDF document text
- http://commune-bourre.com/userfiles/file/40512058435.pdfIn PDF document text
- http://burelomdo.com/ckfinder/userfiles/files/86593378818.pdfIn PDF document text
- https://osiindia.org/ckfinder/userfiles/files/rajivedevusagopixitun.pdfIn PDF document text
- https://iuoshili.com/upload/users/files/36640236019.pdfIn PDF document text
- https://fizjolech.pl/userfiles/file/jofolikefekavofi.pdfIn PDF document text
- https://marigabung.com/contents//files/wofipaditedevidi.pdfIn PDF document text
- https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609813dd7e622---wunune.pdfIn PDF document text
- http://hutbephottaihaiphong24h.com/upload/files/guwijuvizemu.pdfIn PDF document text
- https://ukmalayalamnews.com/userfiles/file/98451013476.pdfIn PDF document text
- https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa09be8d75c---42499303447.pdfIn PDF document text
- http://www.ufolep-69.com/contenus/files/sapowosatojap.pdfIn PDF document text
- https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c4fc5bbad76dd4385da37252dee339a/jokezimofe.pdfIn PDF document text
- https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/54b2baae9d15dffdb5aa4aa5ff57e4a3/riborepotatabe.pdfIn PDF document text
- https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/0thb6p11k393jv4rmr7e6pcr6d/budukodabegi.pdfIn PDF document text
- https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dd9bd6413a---42303715068.pdfIn PDF document text
- http://simonide.org/userfiles/file/75214233790.pdfIn PDF document text
- http://studioboscono.it/userfiles/files/32188661569.pdfIn PDF document text
- http://godsownproperties.com/userfiles/file/ragowikozatojiv.pdfIn PDF document text
- http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a954b7f3666---68298724934.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+determine+the+atomic+massPDF 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_off0000f9c7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF9C7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000111de.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x111DE	10668 bytes
SHA-256: `3a294799d11820c30f8ef520de6869a369a9cd875b8e80365ecee82077ad2cb1`
`font_02_sfnt_off00012a1a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A1A	18676 bytes
SHA-256: `95e42230b7f13c1e8005bbaa6ba3ab3fd480b930b6137fe3e7ee51b4427d028f`

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