PDF malware analysis — malicious · 7ab02b1785e55c80

MALICIOUS

PDF

93.7 KB Created: 2021-09-17 05:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: ef4c4b3de47c996011781aedf62862ab SHA-1: 58d3da940ea9d5bc97fd542f2d8d09c82434260f SHA-256: 7ab02b1785e55c8089bfda358293e576bca79aa63add39a256aace0b3be4de3c

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, specifically as a phishing or trojan delivery mechanism. It contains a link farm with numerous URLs, many hosted on compromised CMS platforms, designed to redirect users to potentially malicious content or downloads. The presence of external URIs and link farm characteristics strongly suggests a phishing or malware distribution intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9927

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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=express+vpn+cracked+apk+latest PDF link annotation
- http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/70vdsb8t7fp7mtogojgmh7a8q8/45170063734.pdfIn PDF document text
- http://konemara.hu/userfiles/file/69385070951.pdfIn PDF document text
- http://writtenmail.com/upload_images/file/31019596991.pdfIn PDF document text
- https://vaynhanh365.net/contents/files/juzodebipepoxolofejevidun.pdfIn PDF document text
- http://cozycornerexpress.com/uploads/files/87350450158.pdfIn PDF document text
- http://bippex.com/filespath/files/20210917093213.pdfIn PDF document text
- https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/9bf8031aa81b015c99ff4ad1d843592d/potefilotu.pdfIn PDF document text
- https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/93dkg47qj3lii27f6o52kulciq/29158477382.pdfIn PDF document text
- http://www.saaegfpolis.org.br/ckfinder/userfiles/files/xirusegesebidorituz.pdfIn PDF document text
- http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139703478c01---naguboto.pdfIn PDF document text
- http://lnyuanzong.com/uploads/files/20210914135433.pdfIn PDF document text
- http://bouwbedrijfansing.nl/userfiles/file/6532243888.pdfIn PDF document text
- http://zezoalza.com/ckupload/files/4089008065.pdfIn PDF document text
- http://quick-thailand.com/images/uploads/file/68907781852.pdfIn PDF document text
- http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613261ef2ad7a---33425723318.pdfIn PDF document text
- http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612faa4b3a43a---naretituwizulezus.pdfIn PDF document text
- http://elosc.com/upFile/file///ITX202109140125454645.pdfIn PDF document text
- https://journalofcritique.com/ckdosyalari/upload/files/dakasenofejaxavinu.pdfIn PDF document text
- https://tims.ro/ckfinder/userfiles/files/30370882552.pdfIn PDF document text
- https://villanakarin.com/userfiles/files/lesepeka.pdfIn PDF document text
- https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4113683c9---45307457498.pdfIn PDF document text
- http://barudan.hk/UploadFile/file/20210901202235583.pdfIn PDF document text
- http://cu-hinothai.com/ckfinder/userfiles/files/24676264786.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_off0000e955.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE955	22504 bytes
SHA-256: `95f13a1699bf2f795773da60ddac486f3763d493e06eec97054b1b9033bc066a`
`font_01_sfnt_off00012324.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12324	16232 bytes
SHA-256: `01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684`
`font_02_sfnt_off000138fd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x138FD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00015114.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15114	10540 bytes
SHA-256: `0bdb31a98437cebd64974331597756fd46ae2903a88e8e8b79e68a96d4981e51`

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