Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6fda49aa54057ed…

MALICIOUS

PDF

84.8 KB Created: 2021-09-13 10:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 78addae0907f9ff24f3335fecec31a08 SHA-1: 9f0351bdf852a725f0588e9af4e08528886925a4 SHA-256: c6fda49aa54057edecbb0160418f0ddf4d2820d98c8ab20ddddac9c0f97d76d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 related to phishing or malware delivery. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/sokufemamu.pdf In PDF document text
    • http://www.uc-kushiro.net/images/library/File/datiganigobijozajoxakegu.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/m0ncblmhrob053i2givv7kjh45/31503433799.pdfIn PDF document text
    • https://limsurdua.com/contents/files/lefavilitaritupusopogam.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/kadirikew.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/wutajaxitoxusof.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/zufixotudi.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/zujerigozarad.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eefd5cfb5a---ruwowuviropanigubixu.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/woxovati.pdfIn PDF document text
    • http://ljsmelt.com/upload/files/53753223571.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/pedelabubirepoz.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/57686739990.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210904154854.pdfIn PDF document text
    • http://juncheng.tw/upload/files/81972975488.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/26382493298.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/zikotubob.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/2614de201d0ee5119e19a49f5e0740bc/pupig.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/tasoginis.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-3/20210903120043519931.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/feniguxetasevokubodafarow.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/7681455209.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130067f33e54---56484879777.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=sex+app+download+apkPDF link annotation
    • 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_off0000e715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE715 10280 bytes
SHA-256: b4a9b554f8b5e5e3deb9b258aa612af4c1e20244b56a31a5ab420a156a3b92c5
font_01_sfnt_off0000fe6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001167d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167D 18132 bytes
SHA-256: 124a77f7766b1abec15d737c76d93146bdfbbdc1bbd695cb9331759bce09709a

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