Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53128d4ee210a34…

MALICIOUS

PDF

72.2 KB Created: 2021-09-29 05:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b504fd1cefb73081f0d2fb775ab7c48 SHA-1: 7919d6b29855cd3c5d6ea3f41b710d92845d4f0b SHA-256: e53128d4ee210a34e10a03b64e59098feb086e56fe6180813ccc091b5e64ffff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/2b5e46ac68fbfb02627d94d9e8f632e0/matemazawoxadolasazojez.pdf
    • http://noithatvietsky.net/media/ftp/file/rinefevazasipiwuxiw.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e1c357e4c---votuxexumumafuvutape.pdf
    • https://r4binsh4h9-att.com/contents/files/rikivarutenabenukafixipom.pdf
    • http://kesherisrael.com/uploadEditor/files/desijulakudepa.pdf
    • https://ivanamihic.com/files/18947723777.pdf
    • http://dienvietbac.com/uploads/files/82007678603.pdf
    • http://aguito.madteam.net/ckfinder/userfiles/files/79146173495.pdf
    • http://textstricker.de/benutzerdateien/terenafovesajofejalamewos.pdf
    • https://senesi-sklad.cz/userfiles/file/nebesowese.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357d88b70d6---45666685627.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151fcca16ad2---nizubanu.pdf
    • https://gulfb2b.com/userfiles/file/bowabilorurefexare.pdf
    • http://thankschicken.com/uploads/files/kewejinapinon.pdf
    • http://mnarch.it/userfiles/files/29439174320.pdf
    • https://consurs.ro/ckfinder/userfiles/files/dalanosuzup.pdf
    • http://pcwenhua.com/uploadimg/file/163094736050798015.pdf
    • http://slxiang.com/v15/Upload/file/202191114429537.pdf
    • http://bytip.net/filespath/files/20210915174742.pdf
    • https://dongphuchuytai.com/upload/files/dorazupenijiwanevuxadokos.pdf
    • https://art-lamps-rali.eu/files/file/korozizi.pdf
    • http://itemclinicchina.com/ckupload/files/rugebigitaxo.pdf
    • https://esterkins.de/ckfinder/userfiles/files/41003237610.pdf
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210929085045.pdf
    • http://otohondamientay.com/upload/files/luwomezitifutawamoju.pdf
    • http://kimwendelldesign.com/ckfinder/userfiles/files/54431112079.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=ludo+ninja+hack+apk+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5e1.bin
24d7eebb11e29d78efc332c8e97246c479f7123211d83f459fb1b921e190b271
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E1 10480 bytes
font_01_sfnt_off0000cd92.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD92 16792 bytes
font_02_sfnt_off0000e5a4.bin
e8b337480139392fb91cb981404ff1f3a09056790e3946f61075a97f4f9db9a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A4 17324 bytes