Malicious PDF — malware analysis report

Static analysis result for SHA-256 a900f2f0913d9a02…

MALICIOUS

PDF

82.6 KB Created: 2021-09-21 01:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 376513bce9c85f409bbdd95a314c7c06 SHA-1: 5b3d9790a56ffe21cf044363a39011995af3596f SHA-256: a900f2f0913d9a028bd5d3b6ea6454e2234c9b65a5f6f6cdb160e19691609d79
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The heuristics 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate that the document contains numerous links pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of these link farms strongly suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/62913546067.pdf In PDF document text
    • http://polipadel.com/userfiles/file/refosogekufagi.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/benurefikovaxi.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/26685475932.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/93714412115.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/lekunegamawavo.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/nobidalovesobubejune.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/94897715609.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/xusotenite.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/xeripal.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/6f337bd83f113997db8ff77104368a77/tezamasidopivivixitu.pdfIn PDF document text
    • http://hzbaoyan.com/images/upload/File/3224686371.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/lasejazato.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a62b94ebf---dodukisevajewemaw.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/tixemumolapanep.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/dirab.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/toronakukigomunup.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/xetezonitajebolesukatizof.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/tevuzovomito.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/wabozigus.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/pemuvovukudiwivinedor.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/3225393760.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/62780331110.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140155bd82b7---lupivimuzivetirudet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=icon+style+for+androidPDF 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_off0000db63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB63 10536 bytes
SHA-256: e1fb8af71f53402925f2c9bafc84a33982163913da6f6ef3491bab801941d663
font_01_sfnt_off0000f388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF388 18824 bytes
SHA-256: 4d7a616eeb2bd4f1c70a276855e0379b0e271941df5ddffc605b75da60b57d57
font_02_sfnt_off0001244f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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