PDF malware analysis — malicious · 9cbc25d0ec11905e

MALICIOUS

PDF

83.8 KB Created: 2021-08-19 12:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 83586cf9484fe79c9bdca3a612f2a7d5 SHA-1: 6efe500f2fa9f8d72c52d4f3b71f46e41840bbc4 SHA-256: 9cbc25d0ec11905e4f2351f47b05e61923b8b2c593a6a08f2b02f7bc056bcc70

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised WordPress upload storage and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for these malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9978

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://merwepizza.com/upload/file/52383120045.pdf In PDF document text
- https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/c7bb9171a191fe738057222e8bcd9960/98244061778.pdfIn PDF document text
- http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaea6e9f959---jejepotefi.pdfIn PDF document text
- http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/50441736572.pdfIn PDF document text
- https://resonanceacteurs.nl/userfiles/file/bajuwa.pdfIn PDF document text
- http://shiokuda1.com/contents//files/29884464956.pdfIn PDF document text
- http://ninfahartman.com/clients/d/d5/d5ac6782717b6a1c58177985440d8e57/File/vaxujuxezeruniralabi.pdfIn PDF document text
- https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/68ids71un6vnrru5uafcsbv3s5/firawukotadanesi.pdfIn PDF document text
- http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbb2774f55---tinadefokaturiju.pdfIn PDF document text
- http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a96664fa---88616005940.pdfIn PDF document text
- https://baxsporthorses.nl/userfiles/file/70284470964.pdfIn PDF document text
- http://backupcenters.com/userfiles/file/gifaziwavivatitepavipoxu.pdfIn PDF document text
- https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/03d7b213ddf659f0e9e1f265f7754e55/8614707961.pdfIn PDF document text
- https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d68826b07f3---79843328400.pdfIn PDF document text
- https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/e208009dc5e8caf41e189e3e7fa684be/30423507991.pdfIn PDF document text
- https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/798376804f21490985c2bb76ecba6563/pitobutifipasuwuvajawun.pdfIn PDF document text
- https://insolite.lu/img/userfiles/files/81908682507.pdfIn PDF document text
- https://menu2uplus.com/images/file/24650695442.pdfIn PDF document text
- http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba683322b07---fumebazitavu.pdfIn PDF document text
- http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c84f2e5d088---15963512820.pdfIn PDF document text
- http://jfac.kr/ckfinder/userfiles/files/69241200479.pdfIn PDF document text
- http://wuxihemei.com/ckfinder/userfiles/files/20210623_024509.pdfIn PDF document text
- https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160792ed255dd9---79526562720.pdfIn PDF document text
- https://eatorhours.org/e-bussiness/fckimages/file/36839916999.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=fts+17+mod+apk+obb+downloadPDF 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_off0000e2bc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE2BC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000face.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFACE	17232 bytes
SHA-256: `44ff567790a596bb8e66e79a9d6a6f61b456b22cdb7c6bb9f82286c8978ccdb3`
`font_02_sfnt_off0001281b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1281B	10624 bytes
SHA-256: `f82455a0a536839b237643556c32b1b00f74d59bb30c0208b3b618422aa7246d`

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