PDF malware analysis — malicious · f49b69eade8407c0

MALICIOUS

PDF

81.3 KB Created: 2021-09-18 06:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 6a0024749109fcb79922d9a07649f7bc SHA-1: cec52dadc944ff1654ea3a2de66f86cc1af89d36 SHA-256: f49b69eade8407c0a16ee902f5595b8e883e631a59d14dcacc6ef858b8afb6f4

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1539 Steal or Harvest Session Tokens

The PDF document contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, suggesting a link farm or phishing lure. The 'SE_MFA_LURE' heuristic strongly indicates the document's purpose is to harvest credentials or session tokens by impersonating a multi-factor authentication or one-time code verification process. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
MFA / one-time-code harvesting lure high SE_MFA_LURE

Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
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://laborke.ru/uplcv?utm_term=samsung+c3312+flash+tool+e2+free+download PDF link annotation
- http://zuche0551.com/upload/file/nonatakupedifexipotuxo.pdfIn PDF document text
- http://madonnina.info/userfiles/files/zegenonepojaxikefumelof.pdfIn PDF document text
- http://agrocare.hu/ckfinder/userfiles/files/rukopesonakozagu.pdfIn PDF document text
- http://dissanna.com/temp/fckeditor/file/42320851202.pdfIn PDF document text
- https://nbretail.com.vn/ckfinder/userfiles/files/49904395666.pdfIn PDF document text
- https://vjlabor.pitscovn.com/uploads/Upload/files/resiluzilopewurimidarox.pdfIn PDF document text
- http://getdol.com/page_data/file/23874476564.pdfIn PDF document text
- https://fototipia.hu/files/files/zibijuvugew.pdfIn PDF document text
- http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161355aa19f199---velamorivudobepimi.pdfIn PDF document text
- http://banghetretunhien.com/media/ftp/file/64960469003.pdfIn PDF document text
- https://homeuu.biz/upload/ckeditor/pages/files/99541003014.pdfIn PDF document text
- http://gianphoiduyloimodel.com/Images_upload/files/loninitami.pdfIn PDF document text
- https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143f0cf52aec---pukegulubuwo.pdfIn PDF document text
- http://xn--80age2amlc.xn--80adxhks/pics/images/file/duzuba.pdfIn PDF document text
- http://raylutickenterprises.com/userfiles/files/gazeduxupakexosaxu.pdfIn PDF document text
- https://ww150006.linebot.net/upfile/files/20210909203349.pdfIn PDF document text
- http://receptlap.hu/files/naporebopovipo.pdfIn PDF document text
- https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/3pom1nfqm3lfc8r6osvucvs907/ditame.pdfIn PDF document text
- http://kangshi-you.com/uploads/files/202109061100265666.pdfIn PDF document text
- http://macabrey-luthier.fr/data/Files/40990650519.pdfIn PDF document text
- http://slhospital.com/upload/fckeditor/file/sipujikupenolevijogifu.pdfIn PDF document text
- https://ariaparvaz.com/basefile/ariaparvazcom/files/sixenorevugewu.pdfIn PDF document text
- https://skatrip.com/basefile/skatripcom/files/60462693600.pdfIn PDF document text
- http://vyveva.eu/UserFiles/File/kideledaladorevuxigeli.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_off0000d662.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD662	17684 bytes
SHA-256: `b1f6828ba910ef4cf20bd0e434c2a443ea2fd6202c6446660175cea68e602d8b`
`font_01_sfnt_off00010496.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10496	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011cad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CAD	11436 bytes
SHA-256: `59023eaa27a54cefdc19717e5319c35c401326e0b572a9d79e871b1edf5a3f7e`

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