Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63a4ac1002afdc3…

MALICIOUS

PDF

78.3 KB Created: 2021-09-12 14:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bb422d250fe2975d2d08667761ac6faf SHA-1: b53a5d47d0cc058368f2fcf2c08ebcd37d69da1b SHA-256: c63a4ac1002afdc314e4b1e15ca98fc26378e13001067eabd35cf2f2a19f8e88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and link farm patterns, indicating an attempt to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=bridge+constructor+the+walking+dead+apk PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337bf26a8d8---vagusexivenotet.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/xifuxow.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/69767778534.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/dusovuguxazabebazodoxewo.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/rugoxipitogigebavenad.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/15236151608.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/tudaweduxikorulegejomanob.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/98e04bad9e5caf1e40185f9582d4546d/tafomixi.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/35530409418.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/19073238807.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/78970519631.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/gudoxun.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/35261580059.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161356d40a05a3---xuvanifasitigevuwom.pdfIn PDF document text
    • http://iccarrentals.com/files/file/7353195222.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210831_214134.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/36477508275.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/3778439865.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/makiputojij.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/wanekoloxiralixamijoro.pdfIn PDF document text
    • https://digicpictures.com/downloads/tofudewulafarivi.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/zukabazazomiwokonunajifut.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/17396396552.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/5156012162.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/dusuluxazobut.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_off0000cb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB27 11124 bytes
SHA-256: 445c234c69b3ba2cc660ea200e326225c1f9fefe359bea5c7dea192fd03fd715
font_01_sfnt_off0000e4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD02 17844 bytes
SHA-256: c2d786504b2e2b9e9ab82c4b9354755457a6d8396e1f1656fb69ffe0f0c8ef15