PDF malware analysis — malicious · 336621626143443e

MALICIOUS

PDF

72.3 KB Created: 2021-09-07 06:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 44c650e05680e7659637f28ea74e9cb2 SHA-1: 111b7ca35f42ddab0c19831b002d6509786caa69 SHA-256: 336621626143443e607fbacb1c1adc35dacc275f03cd8f2857bf0714d43130bf

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or distribute payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9915

Heuristics 7

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.
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 http://thanuyentea.com/ckfinder/userfiles/files/sevaninanekuxereniwutije.pdf In PDF document text
- https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/ffd4918b44119812908aa1a1f7be35e1/desuzirijigopema.pdfIn PDF document text
- https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de778f3a0ed---kifuzujuv.pdfIn PDF document text
- https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/3bf299e7b7f0df9741e1a50cea455b45/lebitebenuxete.pdfIn PDF document text
- https://go2germany.ru/files/file/bixajeritevenavik.pdfIn PDF document text
- https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/re2la9rh06v6hlb7ra1mddgsr2/89856258448.pdfIn PDF document text
- https://kermiradiatoriai.lt/images/files/zevowenimovixojutukeb.pdfIn PDF document text
- http://al-bandak.com/userfiles/file/kuvorumo.pdfIn PDF document text
- https://konferencii.ru/js/ckfinder/userfiles/files/60188573152.pdfIn PDF document text
- http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac47a53479---44214482298.pdfIn PDF document text
- https://conexusinternational.com/ckfinder/userfiles/file/norenobozulijawaw.pdfIn PDF document text
- http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea66f444eb---14966386105.pdfIn PDF document text
- http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/97818351742.pdfIn PDF document text
- https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/b968327bec3c5fcd5601e09c1bc7e1b3/nerulajotonomizojepefa.pdfIn PDF document text
- http://epoch-making.jp/js/upload/files/kigezi.pdfIn PDF document text
- http://sammyuriasproperties.com/userfiles/files/metini.pdfIn PDF document text
- https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/ab8llgnv371v0l68qs7r2bfacb/wovaf.pdfIn PDF document text
- https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/78562542468.pdfIn PDF document text
- https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608402b41b3cf---xotojinafumavil.pdfIn PDF document text
- http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b17e7ea45---18279498646.pdfIn PDF document text
- https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/9569a14837ee18f464aa059ccd407665/pogiferakugofepuxopuzawo.pdfIn PDF document text
- http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085526706b1d---dolutakamowopufazumetu.pdfIn PDF document text
- http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tuwujixupejeninavigapolek.pdfIn PDF document text
- https://petikdaun.com/contents//files/gipano.pdfIn PDF document text
- https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160badece58704---xotadesugebazepapebez.pdfIn PDF document text
- https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d257379bb7---40929298010.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=maxima+and+minima+of+two+variables+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_off0000bcdf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBCDF	11048 bytes
SHA-256: `b1d4bcb7d60060b6bf53d3fe578f50a38a59ab8f0e83d67b84b34fe598081be9`
`font_01_sfnt_off0000d65f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD65F	14564 bytes
SHA-256: `bc6d562184648f2d92226336edfee7a4addf6d0a1c3e57601741cfb7bd4d53e0`
`font_02_sfnt_off0000fb0a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB0A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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