Malicious PDF — malware analysis report

Static analysis result for SHA-256 09ce1848c949e448…

MALICIOUS

PDF

82.8 KB Created: 2021-09-12 08:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 31c197e4ac908e15e66fc5e7bb9909a3 SHA-1: d5b53110b0e31d616f960ff0db37c1105568420d SHA-256: 09ce1848c949e44846814341780c0139c1b293b4ae3a8787aa1d488358428f1f
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised WordPress upload storage, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms strongly suggests an attempt to lead users to phishing pages or download further malware.

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://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/ab1fd6312aafd4124426ca1494d495ed/naxasep.pdf In PDF document text
    • http://www.depomatrial.com/file/21521271525.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/bubager.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/fe85619c73aae192e369869d3d25a17d/gelarugelapofasuz.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/jofinujaroxenerij.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/2e488fcf85d7c5495a0c98579003ae2f/53579202234.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1630619860.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/foxivumotexirenipibaga.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/22821827619.pdfIn PDF document text
    • https://adium.ru/userfiles/file/fosuzebebe.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/kuvigijusigubafujoxoxivut.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/pifufig.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/sedemonijawenogojum.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/44729996228.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/23875813686.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/xezenufavoperejegukin.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/35057469824.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/falozujiluxutupadi.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/miruvilavosaxuvedavaze.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/jutokizurusimozozusebe.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613087035e95c---27039468750.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/4463837641.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210909_000728.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=dr+who+family+of+bloodPDF 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_off0000dd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 10456 bytes
SHA-256: b68f5273fa317192d1fd835b4095240149df0f41c0ffe51d046a3682fa130bc3
font_02_sfnt_off00010d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D02 18704 bytes
SHA-256: 66659189fd4679be230707c978af24e4847eeefa62bcd77c32a587b210757b16

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