Malicious PDF — malware analysis report

Static analysis result for SHA-256 83727ca2e45d421a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 15:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c50fad87298c5f49d4d9ca95edd22b39 SHA-1: 585f2cf14d52747bcd8db09905003079fc569b10 SHA-256: 83727ca2e45d421ab183f5f49c4b4843ed18186106b98ce4bde1564534ca607c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including PDF_RANDOM_URL_LINK and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM, indicating it directs users to potentially compromised or malicious sites. The ML classifier and ClamAV detection further support its malicious nature. The embedded URLs suggest an attempt to redirect users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://huntic.ru/uplcv?utm_term=how+to+block+notifications+in+chrome+in+mobile PDF link annotation
    • https://thegioidongphuc.net/ckfinder/userfiles/files/kinipuxizunamujalobakilix.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/88719613593.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/77593884312.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16136f37fe34c9---26326585347.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/pebijejuke.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/voselagalujitoxo.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bvu/20210920/file/vufisegumagodi.pdfIn PDF document text
    • http://beta-rc.com/upload/files/bulefokuwitapimemobozomu.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/patuwuridagasavut.pdfIn PDF document text
    • https://ms02bet.net/contents/files/tirisus.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/tozalazolixegatorug.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/tivuvodesebusifono.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/24494569336.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/80834659756.pdfIn PDF document text
    • http://robedecreateur.com/img/files/niberid.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b56d0cafc1---36353769613.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/lixagusedilo.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/99658941086.pdfIn PDF document text
    • http://wmasgroup.com/userfiles/file/vojebuwokatudajij.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/genetijovexutezirexugex.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/47148032942.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/jepizeweridoku.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161393e6269849---xorowusupi.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/35168609151.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/40233711561.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/9cc5mvrj5cub5q9qf6gtso32l4/rewopebeluzenube.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.

FilenameKindSourceSize
font_00_sfnt_off0000d6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C5 17464 bytes
SHA-256: d50e3fb2c5995a6c68d8aa6b048d409ca8457e2e94b56c5094dc571e5df17ca0
font_01_sfnt_off000103b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B0 10908 bytes
SHA-256: 84c7197ff69d0c725054529792b691d678f7b51901af88a4e7f6ae70ff8e51ac
font_02_sfnt_off00011ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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