Malicious PDF — malware analysis report

Static analysis result for SHA-256 4446bbc590595dfe…

MALICIOUS

PDF

79.0 KB Created: 2021-09-02 00:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: db70d53a4967ed769895305ace955114 SHA-1: ece457b42681144d36287937cf3b09fe73a54186 SHA-256: 4446bbc590595dfefe915e978b53c22c3fadf5118b8e5526dd84ce2c868202d1
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to multiple compromised CMS upload locations and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a visual download button lure further supports this, aiming to trick users into downloading the embedded malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://elcivan.com/admin/UserFiles/file/rowagituvomibanep.pdf In PDF document text
    • http://ttlh.vn/storage/ckfinder/files/beguzelavexoz.pdfIn PDF document text
    • http://princeverma.in/uploads/files/tasiladeri.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/gaxukuverodopejuzibefi.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/10122820957.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/kebalokumud.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/soxolebuwuxe.pdfIn PDF document text
    • https://mobilityservices.it/file/pabibut.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/849c0efa519c4277a95f4c5c13a11ecb/1155851162.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/0b6bc40c0b58a132a66d53a6b3c4a1bc/gafuna.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/razefapiw.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/kujejopi.pdfIn PDF document text
    • http://vejwun.cz/images/10685883536.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00c94e279c---18744197039.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8256ec9e1---92383070844.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/69df46e256b7265439342532a715fa44/16143978223.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/25346441417.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/95472023180.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/ludolurevijexefolisok.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/regakizeliwifomomi.pdfIn PDF document text
    • https://akemi.ro/hirek/file/jegexu.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/75dkud4pquf0vgnbubj5s43ihj/21647700570.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/21203986732.pdfIn PDF document text
    • http://nfc.soo.jp/file/vofironofukefurinixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=7th+standard+tamil+guidePDF 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_off0000cd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD87 18400 bytes
SHA-256: 19bcb27d2b3a50d7a335dbad0504c3f071bd1696f4b4674999b0c0debff3dbe1
font_01_sfnt_off0000fd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2F 10628 bytes
SHA-256: 9ec7ecc466e38faa5677222b3f4a29d9eb74a7775fe26120e46be614a48b7fc0
font_02_sfnt_off00011511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11511 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.