PDF malware analysis — malicious · e3070cf0d8e96260

MALICIOUS

PDF

94.3 KB Created: 2021-08-06 23:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: eead982e7065d0bdbeeb58650624526f SHA-1: 3b1d0db9e9826d1a541bee1349e259c91927f5f0 SHA-256: e3070cf0d8e962605ccdee3d7ff6764b6dbbaf068cd43b5628b7e6cdf17f2a00

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, including WordPress sites using the Formcraft plugin. The URLs suggest a lure for downloading a game, but the ML classifier and ClamAV detection indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign aiming to trick users into downloading a payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9739

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://twinslock.com/ckfinder/userfiles/files/4789826218.pdf In PDF document text
- http://thietbiotoviet.com/Images_upload/files/62314555802.pdfIn PDF document text
- https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d90e85b10ce---tewazepodifi.pdfIn PDF document text
- https://himalayanthailand.com/image/upload/File/53409283952.pdfIn PDF document text
- http://malifer.hu/upload/file/91805119706.pdfIn PDF document text
- https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16076eb7a8e52e---musarafalixevego.pdfIn PDF document text
- https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14c929efff---liwet.pdfIn PDF document text
- https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109dbe8995fd---29455625784.pdfIn PDF document text
- http://www.advokat.com/app/webroot/img/fck/file/1228180857.pdfIn PDF document text
- https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/84sr46ad5huf1r8gsq5omt9jtg/nalumisiduxisepuzet.pdfIn PDF document text
- http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d4e0500f8---5974006434.pdfIn PDF document text
- http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071a67627ce6---zelunolufupuvedinaretut.pdfIn PDF document text
- http://dansecyr.ca/pdf/file/73713938182.pdfIn PDF document text
- https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/hr4293ips4adnp7jq40g8t1h55/benojisorijafawasevoge.pdfIn PDF document text
- http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qlkeetjkcqrvb5sjtp0pu3fs00/zowizu.pdfIn PDF document text
- https://accesoriosalmayor.com/images/userfiles/file/39563776560.pdfIn PDF document text
- https://cr2tek.com/userfiles/Proj_Name//files/76299492533.pdfIn PDF document text
- http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/zabefe.pdfIn PDF document text
- http://faradtvandor.hu/picture/userfiles/file/toreninizep.pdfIn PDF document text
- http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160703ec6b335a---74546096226.pdfIn PDF document text
- http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a179d754211---wipesozefuzovewatiba.pdfIn PDF document text
- http://superlitefan.com/uploads/files/72898793893.pdfIn PDF document text
- http://airholic.com/UpFiles/WebEditorFiles/file/budetafed.pdfIn PDF document text
- http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160839c576fb74---giluvefuti.pdfIn PDF document text
- http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caeb4d3c0a---96009740543.pdfIn PDF document text
- https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610030efe8847---40097453328.pdfIn PDF document text
- https://twfern.org/upload/ckfinder_temp/files/20210630172144.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=download+game+commando+adventure+assassin+mod+apk+unlimited+moneyPDF 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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000eb1b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB1B	11316 bytes
SHA-256: `cb75e0c887becb7fc60b8878fee3e3d42b13656871958c3a277f97b9ff43f15b`
`font_01_sfnt_off00010587.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10587	1684 bytes
SHA-256: `72bda604c77ca771a1a14ee35dc8ff354b9f00ec81e947fe844e91f3a29209ee`
`font_02_sfnt_off00010d8a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D8A	17288 bytes
SHA-256: `f5b177afdd8b2e34af62492be9ed9d1f417457c6889ff04171ca2cc0b126dc4a`
`font_03_sfnt_off00013ad9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13AD9	16092 bytes
SHA-256: `9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd`
`font_04_sfnt_off0001501f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1501F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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