PDF malware analysis — malicious · 1a72dc242c5e8f2f

MALICIOUS

PDF

90.2 KB Created: 2021-06-28 04:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 99e5c0e2b58515c5c6caca2637b143db SHA-1: 5113bf0cc5909610f36bfe514507292322174369 SHA-256: 1a72dc242c5e8f2f2531496961d554a0bcf92b669c6a49b570812e337c9d2162

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9765

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 http://pechati-piter.ru/userfiles/file/36852259079.pdf In PDF document text
- http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/2qtton8qdadj9u464nrg0q1b89/35368931570.pdfIn PDF document text
- http://brukbet.com/user_images/file/71702671397.pdfIn PDF document text
- http://x04ydivan.ru/userfiles/file/fudolarot.pdfIn PDF document text
- http://ankaser.com/userfiles/file/sugozawepisezanajodil.pdfIn PDF document text
- https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/3h2dpelbuns77qkq15b91u7aj8/55769771743.pdfIn PDF document text
- http://kopdesign.nl/userfiles/file/95886396518.pdfIn PDF document text
- https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/f75484f20764a1bf754d939ab176ee51/wekijusun.pdfIn PDF document text
- http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943015b58db---nuninejeguxew.pdfIn PDF document text
- https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/l1s2bgrbvv37j8mo0lmhd2gc82/senanumukev.pdfIn PDF document text
- https://adepotcustom.com/UploadFiles/file/20210524121640180.pdfIn PDF document text
- https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7ee131c42---jenesugofozewiginakovo.pdfIn PDF document text
- https://dienlanhhonganh.com/images/pic/file/didez.pdfIn PDF document text
- http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160934a969cfe8---lixomupipatireretokaxo.pdfIn PDF document text
- https://ivanamihic.com//files/84480241270.pdfIn PDF document text
- http://marmaraisg.com/images_upload/files/vuzudumimoniga.pdfIn PDF document text
- https://emmaushuis.org/pages/8931216660.pdfIn PDF document text
- https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/gqan4hf6dsis2ph477prlvvlp3/59907733635.pdfIn PDF document text
- https://amadesafar.ir/basefile/amadesafarir/files/8489544205.pdfIn PDF document text
- http://paitoonbox.com/userfiles/files/37050060851.pdfIn PDF document text
- https://bestcoloringpages.com/userfiles/file/25430013681.pdfIn PDF document text
- http://verduciautodemolizioni.it/userfiles/file/50265487968.pdfIn PDF document text
- https://faceless.me/userfiles/files/11069637396.pdfIn PDF document text
- http://rgn2u.com/userfiles/files/wirokokomubano.pdfIn PDF document text
- http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a01bd6749a0---jekininezitoririxaduva.pdfIn PDF document text
- http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/vnmd7296j6ah630usn73665ka7/sufarila.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=two+equal+forces+have+their+resultant+equal+to+either+find+the+angle+between+themPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dc57.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC57	11424 bytes
SHA-256: `987958200c42c98dcbaf79dc87143bd1bb4b33bed5bb607aebc74e8c195ca782`
`font_01_sfnt_off0000f6ab.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6AB	16156 bytes
SHA-256: `15bdb3869d8d4458aad361551f68459b5691bbaf699be9bec01cb82de0a2cecd`
`font_02_sfnt_off00010c23.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C23	20148 bytes
SHA-256: `a91497ff1494dd772a687bdda609965f80835c47757b493927997f258307c525`
`font_03_sfnt_off000141f1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x141F1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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