PDF malware analysis — malicious · d38c37835cec8d82

MALICIOUS

PDF

107.9 KB Created: 2021-08-15 15:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: b283c51621b9692b41d4873c37be7980 SHA-1: b5b170e78a5dc7f901c4d493b91556f6f65ca492 SHA-256: d38c37835cec8d82b7d4f1a32d51c651674c2e3b062003556d5b3357c8016b5e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the presence of numerous external links and the high confidence score support a phishing attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9630

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://pixomot.ru/uplcv?utm_term=pokemon+tower+defense+hacked+unblocked PDF link annotation
- https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/10gk8rvq178m6vdsiqqb1o4uc0/96503281213.pdfIn PDF document text
- http://print-printonline.com/ckfinder/userfiles/files/32556813830.pdfIn PDF document text
- https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1ae341b70---7801577939.pdfIn PDF document text
- http://gokea.org/upload/editor/files/vikibogibisetiwigexoz.pdfIn PDF document text
- https://abicecream.ru/ckfinder/userfiles/files/ruxotu.pdfIn PDF document text
- http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/rubusi.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2498a8e5c---5450287724.pdfIn PDF document text
- http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16256826089.pdfIn PDF document text
- http://www.tiendadelbordado.com/ckfinder/userfiles/files/12558457821.pdfIn PDF document text
- http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c62769dc7e1---71456327444.pdfIn PDF document text
- http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d84d061d58---dudifuwesuv.pdfIn PDF document text
- http://nfrostov.ru/upload/files/30397728679.pdfIn PDF document text
- https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/b58d63ab6b6e808ac4806a0e1de353ed/23712417523.pdfIn PDF document text
- http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a87e4e3ae2---86065888089.pdfIn PDF document text
- http://songhakbbq.com/uploads/files/feworosawasurap.pdfIn PDF document text
- http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cd68cb2f1---jugetuja.pdfIn PDF document text
- https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fb550e9e660---71892268561.pdfIn PDF document text
- http://ahchala.com/img/file/46273158264.pdfIn PDF document text
- https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ke8e2t32rkp59638vh21o66ps5/sorovitutipaki.pdfIn PDF document text
- https://elsa-daulte.com/ckfinder/userfiles/files/ralegojolizevasazasine.pdfIn PDF document text
- http://myphammonly.com/luutru/files/1331939235.pdfIn PDF document text
- http://sochi-vitrazhi.ru/ckfinder/userfiles/files/94614331173.pdfIn PDF document text
- http://uamarkets.com/images/file/satazofilunuduvex.pdfIn PDF document text
- https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/pik63717giveq828u59v84i79s/tepurudebedubibi.pdfIn PDF document text
- https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/8f4fab4138f3a614f2751506ceedef12/murejederoxunibazosil.pdfIn PDF document text
- http://gruppocreta.com/userfiles/files/93634430694.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00012761.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12761	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00013f78.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13F78	11068 bytes
SHA-256: `825d099a8f4a7c37e47d3a4c0eb7378b02a36b130954cda53550cd0df38b2a2e`
`font_02_sfnt_off0001592b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1592B	19020 bytes
SHA-256: `2c8d5bfae8fbc31f89713e8a045c6ea973f458e3425c854c7be089f1d069cf3d`
`font_03_sfnt_off00018b4c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18B4C	16224 bytes
SHA-256: `d6dd8f09a97dbabc13652295f0acfdfb2300323efe6c6ce91bb145bb9206f541`

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