Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a2ef8309b48dc1…

MALICIOUS

PDF

71.8 KB Created: 2021-09-23 23:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 550c2dcce1f21c7bf85c3d0d029ded00 SHA-1: d2b88b137edbd8b755f11632e9773367b3af88a5 SHA-256: f7a2ef8309b48dc1d6c2e90e95298435e2d91c705a0b19cde8d8883909834cd0
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains a link farm with numerous URLs, many pointing to disposable hosting or compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and link farm heuristics strongly indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://mayphotocopydogia.com/upload/files/3580073522.pdf In PDF document text
    • http://sivam.pl/files/file/8879715531.pdfIn PDF document text
    • http://vidiniaibreketai.lt/userfiles/file/xalasivilawatubasaro.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/77519167478.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/gutarezifamexorexebupow.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/waxeviguwo.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/41665631455.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613398eae7b83---fixom.pdfIn PDF document text
    • http://asid.rw/userfiles/file/20247448308.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/91597582502.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/semiburovoro.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/37270834312.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e86fe0644---2765615015.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/zoxofobetonoritiju.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/kufidukodepiwawufovok.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/josaja.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-18/20210918061123818774.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/78227114506.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/99867553516.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/vobutozeturubetakelazep.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/38920495087.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/sufal.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/bekixebozezu.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5d77afdf5---25127630862.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/55959760494.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/tikig.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/70327896834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pokemon+platinum+version+romPDF 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_off0000b6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF01 16144 bytes
SHA-256: d5d8f85ea5c4cc53ccd23028c2c90b0fa0ecb838c5a906e374a09558b74b8abb
font_02_sfnt_off0000f8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B3 10672 bytes
SHA-256: 3500bdf6c6d87e77d4673580774d035e5ca61f423144f16503114e5bcf4bcc95