PDF malware analysis — malicious · 1a8ae49b7f29e142

MALICIOUS

PDF

125.4 KB Created: 2021-07-04 20:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: 152faf8b5bcc960f34aae51cce9aa731 SHA-1: 493794fb6f4469ecd003c15f5d448fcd2362fc37 SHA-256: 1a8ae49b7f29e1424da289bbeda024394d68481d0f3e441f23ec6b5c4dded0bf

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be the embedded URLs.

Machine Learning

Nyx PDF Classifier malicious score 0.9632

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://pixomot.ru/uplcv?utm_term=how+to+not+summon+a+demon+lord+characters+names PDF link annotation
- http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bee03802615---253762938.pdfIn PDF document text
- https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/313458218afed5fde68ea6355c7d0293/xowudatilifejegumus.pdfIn PDF document text
- http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c55f269db55---13969865055.pdfIn PDF document text
- https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/nhr3p0fo90s30brh619j86b5g6/birezobupamano.pdfIn PDF document text
- http://alexlunacoach.com/img/editor/file/99999318192.pdfIn PDF document text
- https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/ogt33sgidgnu0p77tgu8cpvmgk/28863750590.pdfIn PDF document text
- https://bhsbeacon.com/FCKeditor/file/35698009161.pdfIn PDF document text
- https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf79e7dac0---tapafubodimag.pdfIn PDF document text
- http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/069e4deb2945870a73f94dc1eb95e5f7/94448514007.pdfIn PDF document text
- https://thietbivesinhanhhuy.com/asset/files/78447027676.pdfIn PDF document text
- https://www.indoorclub-informa.com/boletines/img/file/lepuse.pdfIn PDF document text
- https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/b1350856a6b42e9796677d54e7960b97/26793961367.pdfIn PDF document text
- http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c88de1890d---giluxeripakuwununizu.pdfIn PDF document text
- http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04ef7cd868---82179339096.pdfIn PDF document text
- http://grandinhr.eu/images/user/file/70909923302.pdfIn PDF document text
- http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d8afefef138---gojojoponudewowosutu.pdfIn PDF document text
- http://remont-elektro.eu/archiv/file/74439302198.pdfIn PDF document text
- http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079564668eaa---xagezesotage.pdfIn PDF document text
- https://driftwoodcc.com/userfiles/files/vupon.pdfIn PDF document text
- http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097008ed0caa---faxokurowozetovilikafapi.pdfIn PDF document text
- http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717b35314d4---50778856980.pdfIn PDF document text
- http://copy2d.com/ftp/image/file/damilunisijukez.pdfIn PDF document text
- http://jagatjyotischool.org/jagatjyotischool/userfiles/file/58100095060.pdfIn PDF document text
- https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/reour6ojd3hk3e5nbttd1a4vrt/dakoko.pdfIn PDF document text
- https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/47977841842.pdfIn PDF document text
- https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/e5c25924d55169df9bf604d0d8415f82/zurusujok.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_off00010b91.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B91	26192 bytes
SHA-256: `d264da13de59bc1b32239f5da0166e2b95fc588120089986cb349828bce295d6`
`font_01_sfnt_off000147f6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x147F6	10720 bytes
SHA-256: `3473bf12e9e66ace9548f3a4ed278c8a00c2793fdcea7f688204136d348039d6`
`font_02_sfnt_off0001606e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1606E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off0001787c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1787C	40184 bytes
SHA-256: `e405b1f59a9b36dd6a577e431c101af76f3a0d02922fc7b27371220773d0003d`

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