PDF malware analysis — malicious · aa4a31d99b95742c

MALICIOUS

PDF

80.4 KB Created: 2021-09-12 13:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 00be77515a8318128e2423fb15e70b96 SHA-1: f8f95dd81c415ec42e19b66991bd8e0a4e99c291 SHA-256: aa4a31d99b95742cd93bcc6e096e6d18177224c7b7278a03a7074056acb840c4

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, some of which are hosted on compromised WordPress installations or disposable domains, suggesting it's part of a link farm designed to redirect users. The presence of a 'download button' heuristic further supports the idea that the document attempts to trick users into downloading a payload. Although no scripts were explicitly extracted, the nature of the heuristics and URLs strongly suggests the PDF is designed to exploit vulnerabilities or trick users into downloading malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://allytemp.ru/uplcv?utm_term=windows+10+64+iso PDF link annotation
- https://profession-your-dr.com/uploads/files/202109090209185354.pdfIn PDF document text
- https://fablab808.com/nbloom/fckuploads/file/54379588326.pdfIn PDF document text
- http://bodemveenweiden.nl/bodem-veenweiden-img/navoxikujesokexaseguzupe.pdfIn PDF document text
- http://enjoybowlramenandpoke.com/uploads/files/xalaruru.pdfIn PDF document text
- https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a5f9ea716---6735791361.pdfIn PDF document text
- http://coral-travel66.ru/admin/ckfinder/userfiles/files/7777119204.pdfIn PDF document text
- http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137d03c51ae6---40630452450.pdfIn PDF document text
- http://bentleyplemtech.ru/userfiles/file/63727025726.pdfIn PDF document text
- http://all-premium.com/user_file/files/6602597342.pdfIn PDF document text
- https://sukaunited4d.vip/contents/files/16703494405.pdfIn PDF document text
- http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jegeguronepaginewez.pdfIn PDF document text
- http://studiodrago.eu/userfiles/files/tisenajifiwomafujo.pdfIn PDF document text
- http://rucodelniza.ru/userfiles/file/49477539759.pdfIn PDF document text
- http://hillcrestneighborhoods.com/userimages/52268337909.pdfIn PDF document text
- https://tsafar.ir/basefile/tsafarir/files/munatalularazuwewovu.pdfIn PDF document text
- https://shopinhome.com/ci/userfiles/files/tififugi.pdfIn PDF document text
- http://czdashan.cn/uploadfile/file/2021091213302773499.pdfIn PDF document text
- https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/55s0226ib0hd9vrt2chli01dhl/wusaguvot.pdfIn PDF document text
- http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/0f99dhbv458tnspinc2vrauje6/vezokunejiferarekelef.pdfIn PDF document text
- http://rc-mst.com/mst/_upload/files/85852239253.pdfIn PDF document text
- https://12waktu.com/contents/files/nulewuxozuvugudibixobujuz.pdfIn PDF document text
- http://asacnfservices.com/ckfinder/userfiles/files/46049897962.pdfIn PDF document text
- http://apartament-krokus.pl/userfiles/file/tudok.pdfIn PDF document text
- https://tes-sys.com/uploads/ckfinder/files/20210908/16310630817517.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_off0000d60c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD60C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ee1e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE1E	18088 bytes
SHA-256: `16a4f945d1ed139bdeddf2142637161255cc604d4b146159fa82f467060adb6a`
`font_02_sfnt_off00011cf7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CF7	10200 bytes
SHA-256: `46ca0d1fc504c28407de38bd859c4d3fc3e2e85098b1d9efc8610c4faf79f61c`

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