PDF malware analysis — malicious · 38c8812707f05296

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 16:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 635f5e741fb832c1e2f2bc6e1df82bb0 SHA-1: ad18eec6b357a152cf1511b61606e7101bc9da67 SHA-256: 38c8812707f05296b184472bcc309db1f249e0f8bee2ca8bc0f05219d17c4c47

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=okidata+microline+320+turbo+user+manual PDF link annotation
- https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/5e1nu1to4nl6jm26upib6mhvcl/91887478551.pdfIn PDF document text
- http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/3c31a687833c8fa1bb4562d50e58338e/wovusegaxeligulafekawu.pdfIn PDF document text
- https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/xamijuzunikazutasubova.pdfIn PDF document text
- http://podwierzba.eu/ckfinder/userfiles/files/bujipagalijomin.pdfIn PDF document text
- https://pearproperties.in/userfiles/file/luduxuzajugog.pdfIn PDF document text
- https://boumqueur-edition.com/upload/fckeditor/file/genasejazebimozigokine.pdfIn PDF document text
- http://pampa.be/uploads/userfiles/files/jizuragizaxegogovesotixa.pdfIn PDF document text
- http://musicpark-live.de/userfiles/file/73545038377.pdfIn PDF document text
- http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/4576b20d21dc166ca6226ee3a8bf302d/59939174192.pdfIn PDF document text
- http://cbcom.eu/ressource/site-image/files/lelodegugutidepileki.pdfIn PDF document text
- http://centralwestwoodclassof1983.com/clients/c/cd/cd4b3c89dd1500142a52f05b9125c350/File/17912682146.pdfIn PDF document text
- https://nadinerogger.ch/userfiles/files/49495205610.pdfIn PDF document text
- http://amandatravel.com/userfiles/file/88797978511.pdfIn PDF document text
- http://restaurant-lyons.fr/userfiles/file/sirujadetit.pdfIn PDF document text
- https://duext.com/wp-content/plugins/super-forms/uploads/php/files/745b2e9a82e797b14f45f497a9b3ed65/wemare.pdfIn PDF document text
- http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/flk7bflo2o0v3h11jaii5qos44/wusivomogopogawedu.pdfIn PDF document text
- https://greenline.bg/userfiles/file/49977112423.pdfIn PDF document text
- http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/940dc500e2ac630f8e9b867a11bb3253/guvawelorem.pdfIn PDF document text
- http://techbico.vn/uploads/image/files/dubizorowanefajezili.pdfIn PDF document text
- https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325f5c6b05d---vanimogigupavexegufazuti.pdfIn PDF document text
- http://banglatalkies.com/dynamic-images/cms/file/69266625752.pdfIn PDF document text
- http://csaladiegyteruautok.hu/userfiles/files/pemizuxapeditopid.pdfIn PDF document text
- http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16118e655028bb---95685453472.pdfIn PDF document text
- https://haidangpc.com/contents/files/womefej.pdfIn PDF document text
- https://akapacha.com/userfiles/file/26298847776.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dbd4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBD4	11300 bytes
SHA-256: `6901c3b7bb86e144a05d4545482d48104568c363524af6d77c0d7e3c84192e18`
`font_01_sfnt_off0000f66d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF66D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010e7f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E7F	18976 bytes
SHA-256: `7dcc265f9e2fa6accc638ec925b28a3dfc205586fe7b5beea5dab97783f096d2`

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