PDF malware analysis — malicious · 42a51040eb4b8c8e

MALICIOUS

PDF

83.4 KB Created: 2021-09-16 23:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 63e7efaf4ce2b2babe103c5d9239dba3 SHA-1: 193122eca158da02da90281abce690e945033224 SHA-256: 42a51040eb4b8c8e1895303560a70919ec318da1ae7d21bb03acdc88a671d5ea

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The presence of external URIs and the overall structure suggest it is designed to redirect users to potentially harmful content, such as phishing pages or malware download sites. No scripts were extracted, but the PDF structure itself is leveraged for malicious redirection.

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://queure.ru/uplcv?utm_term=download+pes+ppsspp+2020 PDF link annotation
- http://shyjjc.com/v15/Upload/file/2021921312286909.pdfIn PDF document text
- https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/i2cgbor5gq0m9nt4robs46n7bm/64261486087.pdfIn PDF document text
- https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/31aa493f5b87caf9cb651893ed57d7cb/lemubelojomuriralifi.pdfIn PDF document text
- https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613818a11f5b6---gusidekiruluf.pdfIn PDF document text
- https://youxsoft.com/uploads/files/10249425117.pdfIn PDF document text
- http://dorrstrechy.cz/UserFiles/File/dezizirina.pdfIn PDF document text
- https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/514ae45c9be3d105117a41c95345af8d/93766701507.pdfIn PDF document text
- https://masihpt1.com/contents/files/pedawafesorukifoxutigu.pdfIn PDF document text
- https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/96589110849.pdfIn PDF document text
- https://buzascsaba.hu/userFiles/file/rizekatifosoruzeni.pdfIn PDF document text
- http://rld-carbon.ru/file/kagemusirotusomi.pdfIn PDF document text
- http://25630638.kad.tw/kads/ckfinder/userfiles/files/durefivesobamorur.pdfIn PDF document text
- https://technoarc.net/userfiles/file/64581233962.pdfIn PDF document text
- http://rgn2u.com/userfiles/files/8230668109.pdfIn PDF document text
- https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/22036538993.pdfIn PDF document text
- https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8911f297a1b3cc5839e53415401b8e34/mesuzelexegulemokizadu.pdfIn PDF document text
- http://sake-tori.com/images/library/File/kapikevi.pdfIn PDF document text
- http://riviera.az/userfiles/file/matawarafenitanirikazoje.pdfIn PDF document text
- https://angkagenap.com/contents/files/xerojemivapisituxekaves.pdfIn PDF document text
- https://aromamarketing.md/img/files/27785474313.pdfIn PDF document text
- http://ldkxzzs.com/images/userfiles/file/vikotisuwudetozototo.pdfIn PDF document text
- http://89928386.com/uploads/files/202109130847245374.pdfIn PDF document text
- http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/19385786568.pdfIn PDF document text
- https://travellifeafrica.com/ci/userfiles/files/wivikibenekojap.pdfIn PDF document text
- http://foodchemsino.com/d/files/wigubitarunujupipiv.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_off0000dd10.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD10	10424 bytes
SHA-256: `dac9eb3f70d5cf56c008886c944f72fc7eb62b890bb170833291ef6560383df5`
`font_01_sfnt_off0000f4e5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4E5	19356 bytes
SHA-256: `ca3ecfc5aa734adadb083423ff1d22d4ff97a2e86ed579c9c74164b055dc9adc`
`font_02_sfnt_off00012796.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12796	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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