PDF malware analysis — malicious · 005282c2273e4772

MALICIOUS

PDF

72.7 KB Created: 2021-09-10 12:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 4ca18729725727c030db0c3a3a1ffb5d SHA-1: 2937efb4f9b203811a0a2dac3d0dba46df4af0b5 SHA-256: 005282c2273e4772b56afc5683910c2bebc9fbbcb1b19427fbf48e7f2ddc1222

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm pointing to compromised or disposable hosting. The embedded URLs, such as 'https://queure.ru/uplcv?utm_term=primary+2+reading+comprehension+pdf', are likely used to redirect users to malicious sites. The PDF structure and the nature of the URLs suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9827

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://queure.ru/uplcv?utm_term=primary+2+reading+comprehension+pdf PDF link annotation
- http://corising.info/sa_upload/userfiles/file/20210904221119.pdfIn PDF document text
- http://insfilings.com/skyzone_classic/upload/files/xugirelirogojoleg.pdfIn PDF document text
- http://originalbau.hu/imagesfiles/8988994903.pdfIn PDF document text
- https://emmaushuis.org/pages/7903873411.pdfIn PDF document text
- http://worldnaturalfood.com/image/upload/File/81055202669.pdfIn PDF document text
- http://intproplaw.com/admin/uploads/file/65541406632.pdfIn PDF document text
- https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/vs7dddj9csh6bkkeuvjsbqrg0s/51820272774.pdfIn PDF document text
- http://obasekiestates.com/UserFiles/file/gajinejolota.pdfIn PDF document text
- http://wedooverseas.com/userfiles/file/manuzubuzalugewewubi.pdfIn PDF document text
- http://evolutionchonburi.com/userfiles/files/94714993960.pdfIn PDF document text
- http://kkagro.com/media/images/upload/file/govikefow.pdfIn PDF document text
- http://geometracosentino.com/userfiles/files/81514440942.pdfIn PDF document text
- https://adurucui.com/ckfinder/files/7224622297.pdfIn PDF document text
- https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16138a974adf6f---92716905783.pdfIn PDF document text
- http://cloudinfo01.smartevolve.com/images/ckeditor/files/67454331108.pdfIn PDF document text
- http://wxbeimei.cn/upload/ckimg/files/202109080528395444.pdfIn PDF document text
- https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/46422932086.pdfIn PDF document text
- http://uptindia.com/newsimages/file///seseletil.pdfIn PDF document text
- https://samsungdvmklima.com/upload/ckfinder/files/pifufajimaxo.pdfIn PDF document text
- http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f91f95774b---87666197172.pdfIn PDF document text
- http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/1pg09rj0ec98fhp7caqk76gsaj/61381685240.pdfIn PDF document text
- http://daotaonhaccong.com/uploads/userfiles/file/wukazi.pdfIn PDF document text
- https://0286869143.com/editor_images/files/nizasipiwigepakukok.pdfIn PDF document text
- http://hkalc.com/userfiles/zutulawikoruputiw.pdfIn PDF document text
- http://harc-ias.vn/Images_upload/files/genarufapewirafaretujudi.pdfIn PDF document text
- http://paillasse.hu/userfiles/file/35699023994.pdfIn PDF document text
- https://girilawfirm.com/content_files/files/dixajepawudafoxawasoniwav.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_off0000bba9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBBA9	11156 bytes
SHA-256: `566982f0d5e109bcbfa0f14601dae72c9c8f84303f3e9d16cc37901f12f34dd2`
`font_01_sfnt_off0000d55c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD55C	15504 bytes
SHA-256: `39e45e89962ef6b9b25a76bbd274f7d5dc9e82c7b28d80eb4972926794064b74`
`font_02_sfnt_off0000fd1e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD1E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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