PDF malware analysis — malicious · 4f3c26253cc3912a

MALICIOUS

PDF

90.2 KB Created: 2021-07-06 21:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: a8a966aa45fb5f3638288b5ed7fda2ea SHA-1: 11740f73660bade320cea47761ba2114f6bf03f9 SHA-256: 4f3c26253cc3912a02bf38213dd1e6c4cebfcebad07aa80b5ae4fe18862a3d35

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. No scripts were extracted, and the document body was unreadable, but the link farm structure and heuristic firings are sufficient to assess its nature.

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://dineflon.com//files/81767716978.pdf In PDF document text
- https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/8aa2f4ce247fe58c844cb6dc38545ed8/2339433876.pdfIn PDF document text
- https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/71em7mfhri1bbjt9shr543v6p7/faketunimeb.pdfIn PDF document text
- https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608245ba833f3---fadugasulinanipatukotul.pdfIn PDF document text
- https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/84417510876.pdfIn PDF document text
- http://w-f-l.de/user_img/file/ruvolazololo.pdfIn PDF document text
- https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbcd3ade8b---26453792628.pdfIn PDF document text
- https://rybczewice.pl/userfiles/file/86860260442.pdfIn PDF document text
- http://veronikavilla.hu/userfiles/file/bitasamesudamogadiluvakum.pdfIn PDF document text
- http://sooclose.eu/upload/File/51167046586.pdfIn PDF document text
- http://hart-metale.pl/gimnazjum/userfiles/file/4550947915.pdfIn PDF document text
- https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/fq3g3n83rp124mdnavvfack7hm/gamebotadasuxe.pdfIn PDF document text
- http://asbu.net/uploads/FCK_files/file/37802950294.pdfIn PDF document text
- https://serwisnawigacji.pl/userfiles/file/2376891261.pdfIn PDF document text
- https://2acontractor.it/images/file/ledapiwi.pdfIn PDF document text
- http://makinsushi.com/uploads/files/59617604161.pdfIn PDF document text
- https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/855c7f105da00acd35a8a5b2c3474929/noxavidekifalinamobixo.pdfIn PDF document text
- https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/ad0f8be1065ab6813d2fdc9b8df8186a/68113555800.pdfIn PDF document text
- http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160beafcd05885---bofinarinudovakezizo.pdfIn PDF document text
- https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c8658506d1f---tazuvefigeborugopegana.pdfIn PDF document text
- https://vandolderskb.com/images/usr/wumanetabuwakuve.pdfIn PDF document text
- http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2700aeb3e3---10420307284.pdfIn PDF document text
- http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c14abfd0072---11539262936.pdfIn PDF document text
- http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f362ecc9a6---rapukudasazuvimakilaxe.pdfIn PDF document text
- http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aeaf098d455---59546241160.pdfIn PDF document text
- http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16072b8f5b1448---rolesezalomivife.pdfIn PDF document text
- http://arunimaflavours.com/userfiles/file/sukavobomorovusoru.pdfIn PDF document text
- https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf7f8e5bad---morexusibepesozasomeribek.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=fulbright+scholarship+online+applicationPDF 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_off0000fbd4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBD4	10872 bytes
SHA-256: `0aec5735ec24ae33a6c98f031b2deff3cfd40298e508238014e03bed965eefb2`
`font_01_sfnt_off000114a3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x114A3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012cb5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12CB5	17624 bytes
SHA-256: `af00afac8755837dbf3df43aa23f7db8636273b70969205bb822f9f612321d62`

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