Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf99224be5c928d7…

MALICIOUS

PDF

80.6 KB Created: 2021-08-11 19:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: e0c17bd189868fb0a56299bf308e4459 SHA-1: 348948927f7e5d0e4d0e00e5836bb4ec48b72f7b SHA-256: bf99224be5c928d7abf9a6a91802dcce98d45c983868b2eb49449f4bc87dbddd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://airconbank.com/upload/fckeditor/file/wamofuzusar.pdf In PDF document text
    • https://my-natural-style.net/upload/files/33061425239.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/30226157144.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/34dec762c75a2b0fb755e0c052031460/saruvudasewuxajumudulib.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/99536df99784346e450802f47b84e824/50827437301.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/guzinunevuxidaki.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b730a87ae7b8deb53212f12c63cfd073/3866145025.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/fufezelarutovuf.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/68615612065.pdfIn PDF document text
    • http://luatsubienhoa.com/upload/ck/files/misasisufomuso.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/0b98b0b2a2c1b89b0e8ad69c879bb0e4/vodafunedikobogozixu.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/59395285182.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/22545853826.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/80385651692.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8de265f5f---guviveker.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d215cc97e7---misekepuxifa.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/gizot.pdfIn PDF document text
    • http://mvhs1964.com/clients/2/20/2030ff4f331b14c2016b95997514b7ac/File/rafabudezerolikuxufunowut.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/19651525695.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/dorixotavakavazarizux.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/likiguwikasaxizemogixoji.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/fexusawejewisipigoleroku.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/balupasozelawojixarawemez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=persian+calligraphy+books+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00011c50.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11C50 16672 bytes
SHA-256: 57500ac1213000051dc8ce8a9a784c694dfbbdc872b30393e5512c96d01955a4
font_00_sfnt_off0000bedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDF 16684 bytes
SHA-256: 9f58dcd76f2284586cc469c853f570d43462c00b7346bed53d36c8f8e07491d8
font_01_sfnt_off0000eab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB3 11148 bytes
SHA-256: fd7a3e529ba8fcd8d4bf99925c66d72a6da8f0d39b725f08c2ac7ec936d52f82
font_02_sfnt_off0001043f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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