PDF malware analysis — malicious · c918c2fc809cd6ae

MALICIOUS

PDF

89.5 KB Created: 2021-06-28 04:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 584c2df425921911294d3c2d3fee8fdf SHA-1: acfff48da92c028fc3f698b8c70305e1fc8d86a4 SHA-256: c918c2fc809cd6ae6337c366c284e0a88ab013c1f9dab6699e9a9f50c120cafe

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous URLs, many hosted on compromised CMS platforms or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are designed to redirect users to external sites, potentially for credential harvesting or further payload delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9822

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://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/c2cab316723f4014f40e1f894780d5be/mexufafek.pdf In PDF document text
- http://moristas.com/userfiles/files/gopuloj.pdfIn PDF document text
- http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d12a55cfe---foziwe.pdfIn PDF document text
- https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/qa4lm2v5tgun68fvvfo8ndvkjp/zetigadev.pdfIn PDF document text
- http://hnkingdee.cn/Files/file/20216211624.pdfIn PDF document text
- https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/7b77b016afce2673517a2f2bd9a7cb51/11950554915.pdfIn PDF document text
- https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92f806384---52065402433.pdfIn PDF document text
- http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/bgjc9rr7he7dsfgg6kvgj4c5tl/taxofewogumaxevagurixo.pdfIn PDF document text
- http://bjsprt.com/uploadfile/file///2021051920200410.pdfIn PDF document text
- https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/2d63b053a703913cd96a97448c6de21c/61130688900.pdfIn PDF document text
- http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f3aad62c0---41498640825.pdfIn PDF document text
- http://accronline.com/userfiles/file/52336523864.pdfIn PDF document text
- http://aksaaydinlatma.com/img/editor/image/file/kodomis.pdfIn PDF document text
- http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6mdpmq34ds9kgrqfb04344t7s7/vudutotanoteno.pdfIn PDF document text
- https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/e45020e2cf83157399ada08b730c95b1/xebifepositilol.pdfIn PDF document text
- http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746f505fbcb---10513779013.pdfIn PDF document text
- https://allcreaturesinc.com/files/files/3713150920.pdfIn PDF document text
- http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ced3138cb68---65440994262.pdfIn PDF document text
- https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160c151d011366---3942092917.pdfIn PDF document text
- https://przyklejki.pl/userfiles/83276927945.pdfIn PDF document text
- https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/993759ec1c08e03f18382bd124745e52/widupananajononizutul.pdfIn PDF document text
- http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e2a701417---2337430301.pdfIn PDF document text
- https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5ad29c1fa---zesododomijogusifoburefu.pdfIn PDF document text
- https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a4e7b1e31---70288456581.pdfIn PDF document text
- http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4c0b76261---wirazefaluxudadidoru.pdfIn PDF document text
- http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607274489125d---68179919322.pdfIn PDF document text
- https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607abd8fd6fbd---wifovizidez.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=epilepsy+with+status+epilepticus+icd+10PDF 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_off0000fb2f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB2F	10744 bytes
SHA-256: `b478f71aa2e9926c91de2ea9ceb7fb091d7698a84b21cd3876ad9ab6d29f0f45`
`font_01_sfnt_off00011420.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11420	16940 bytes
SHA-256: `1e3e7b38e79046c73c51573085e40ab561742700b316a1e9577ec4b3405cb82b`
`font_02_sfnt_off00014021.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14021	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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