Malicious PDF — malware analysis report

Static analysis result for SHA-256 9972bac9a7494150…

MALICIOUS

PDF

87.4 KB Created: 2021-09-15 12:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ad781b1b2a9ac00af91ca90e52a039ec SHA-1: 11a20893b312ac30ca35bc6a89360fbfde336a3f SHA-256: 9972bac9a74941506ea713561808a5bfae8a39c54c9535501b4cb10e7d2222a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://oniceh.ru/uplcv?utm_term=how+to+add+app+to+home+screen+android PDF link annotation
    • http://onishi-kyosendo.jp/archive/suxiwi.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/jesiva.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/33441205547.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210911_B4C507D1B94745CF.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/42241382076.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210906154304.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/38675925905.pdfIn PDF document text
    • https://rintrans.com/files/pojowekagewojepugel.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b29a34915---6879730198.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/55157461614.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/5bc6e92e4b020437c9d78c16fe175315/jawazewalis.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/luwijixosipalilapoxazopow.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/3101910272.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210910_F547C8726463AA17.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/93033371471.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///32715582041.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/nomudexare.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/debipu.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/busexixowotilibu.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3c7d038bc---13524871418.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/53075204335.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/82628832298.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/58554444808.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/28666716.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/wavogidasibimuwudakegod.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/loluwifuwamufax.pdfIn PDF document text
    • http://capital96.com/userfiles/file/jopokoxuwo.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_off0000f1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E6 17436 bytes
SHA-256: 7081cc711d108aa4edbbbd551cf55324cc57ec1fd502cc14a6a1518dce1ac30a
font_01_sfnt_off00011f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F28 10808 bytes
SHA-256: 9ecac56d542aa01a635e404407e6f886fb029f2b760c9b768cb1c3af8efd81a0
font_02_sfnt_off000137ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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