PDF malware analysis — malicious · b74ff1c4c14b218e

MALICIOUS

PDF

90.1 KB Created: 2021-07-29 23:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21

MD5: 49df5200fff7ba8a270464fd2ca76529 SHA-1: cb21ff14c2190f10469d3e0c46af8156e93f860c SHA-256: b74ff1c4c14b218ee79bac1308945f3e3409bf6b5f37e71fa1fab5ca065725fb

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The document's structure and embedded URLs suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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 http://omonetach.pl/foto/ilustracje/file/94046495552.pdf In PDF document text
- http://mikomisushiwc.com/uploads/files/8235391062.pdfIn PDF document text
- http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7237a56ef---sexesewerujakez.pdfIn PDF document text
- https://inoxquochoang.com/app/webroot/files/images/pages/files/51285442808.pdfIn PDF document text
- https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/fdba21e445c86ddd18773a2063532e3a/99218147556.pdfIn PDF document text
- http://sanga.asia/userData/board/file/46609990206.pdfIn PDF document text
- https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/0a78197a3eda3ce932328879cf140347/40623727755.pdfIn PDF document text
- https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/9r0genqtpme15cq7h4q7oc7mo1/durojopojepakulim.pdfIn PDF document text
- https://rsun.pro/admin/ckfinder/userfiles/files/88202341704.pdfIn PDF document text
- https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbe011aca4a---5343120186.pdfIn PDF document text
- https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/e075f1a932feb881c65ba9565430528a/62879343700.pdfIn PDF document text
- https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/53e2e86521fc034e730f612b2bb1192c/90147249418.pdfIn PDF document text
- http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609635a855335---81012724456.pdfIn PDF document text
- https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/1567bfb05fde018b6b5e63880755a4f1/10891525296.pdfIn PDF document text
- http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b45622737b8---9137471428.pdfIn PDF document text
- http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608088f593129---83362611278.pdfIn PDF document text
- http://escuelasfutbol8.com/docs/files/14588035845.pdfIn PDF document text
- http://smclassof57.org/clients/34860/File/kazuvimil.pdfIn PDF document text
- https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/epgqejpn95d7i68obousiuslr5/78279175482.pdfIn PDF document text
- https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c41b06c1824---80283507375.pdfIn PDF document text
- http://reelproductionshd.com/userfiles/file/pejisetudulevi.pdfIn PDF document text
- https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f15b3c06ae---85687967470.pdfIn PDF document text
- https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac050d9a006---xorodopatapoxutajaz.pdfIn PDF document text
- http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16095df878261b---saramuvidoxuvewokezenomiw.pdfIn PDF document text
- http://baigeleather.com/userfiles/file/zofafugokabotetaw.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=corel+draw+x7+free+download+full+version+getintopcPDF 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_off0000fa4f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA4F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011261.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11261	17188 bytes
SHA-256: `bf4e712c75aeb6387d484666258abf64e6e15b1223db21fd46a72a8e70fb2f14`
`font_02_sfnt_off00013f7e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13F7E	11232 bytes
SHA-256: `7153eb136704b617f3c0ae062ec504a4586c3185bd9cecca2f9456bc48bfbfaf`

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