Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8595f4f8bd46af…

MALICIOUS

PDF

78.0 KB Created: 2021-09-09 02:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1296ff63adc3d3ba6a92adca594fc2b7 SHA-1: a53769ee8ba2cf859bfff5558d385a7f357eaa0c SHA-256: 3a8595f4f8bd46aff35965d9b47a371a106ec331dcacf76d128e8953abc889ba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF acting as a link farm, directing users to compromised WordPress sites. The presence of numerous unknown URLs associated with these compromised sites suggests a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134638439d71---21194478328.pdf In PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb4a789a2c---92810910184.pdfIn PDF document text
    • http://mariancozma.com/_user/file/pofarokixosomifemazem.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/nowafumorimodorefezuponuk.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/20635202129.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/10730933212.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/zosedo.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/3450773676.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/jesidezulim.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/83433200579.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/43316560025.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/rakotixugesijawaf.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/21038641983.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/fusemujigosujipu.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/najuzalajenugep.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/88532229247.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/jepolapegevowavefejagi.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/majogibosedad.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b0b0e366a60ca54ffaafa392108984e4/55165536886.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/48377331660.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/vawituwa.pdfIn PDF document text
    • http://yibetter.com/data/files/69181924582.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16134d01e23724---jisolefonudifasidunef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+quiet+man+watch+online+freePDF 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_off0000cb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3F 17588 bytes
SHA-256: d1650cc4e7e3ef2b3d400bd86f816eae09c7d9ae17e9e2ef3a27bca69d900aec
font_01_sfnt_off0000f94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11164 10728 bytes
SHA-256: 478bfc9e7f9450c820a8763f1e5c65aa059d43ef3a2c6fe5ba049dd39a20f2b4

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