Malicious PDF — malware analysis report

Static analysis result for SHA-256 4408a2e3f967b4f5…

MALICIOUS

PDF

84.7 KB Created: 2021-08-23 11:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 931ea8693c20daf4d8110ade09523639 SHA-1: 25813b6ba7be609c746a0d2a2268fa829ba09ec9 SHA-256: 4408a2e3f967b4f59d8724643cbeeabeaf5822d1476e0a03c26846ff2eab5537
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the PDF structure and numerous embedded URLs strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://logtech.cz/foto/Image/file/82100291187.pdf In PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/7736159509.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/50209677819.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/materepedarojevufudew.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/dalimetesofavikemapevot.pdfIn PDF document text
    • http://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/69172370006.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/77219366771.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/88055267879.pdfIn PDF document text
    • http://banghenails.com/upload/file/53606456017.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/69149522471.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/mivobojepuxodaximoxofari.pdfIn PDF document text
    • https://zzhqhi.com/d/files/xezanuborifewapujuwogima.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095fe51e290b---30446549490.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/848025697e10aa22dc2a5b8314a8bdad/56887643414.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adacf13e3ba---lemorenexutod.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/a8bac7d8bd10aab140930ee4b4d664b6/17189726982.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960690dae44---27265241336.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202108022054327722.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3660c18df1---savokelegajusokaxufefurej.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1625462025.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160878532d4dc7---12732812871.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/midodidanalebuvowosifimur.pdfIn PDF document text
    • https://actorconseil.com/files/file/bawolegudiz.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6da2397ccf---75491224932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+see+annotations+on+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE878 16796 bytes
SHA-256: 59cc8f1012ddae5e52e7464aed9e92daefff058a2131bbdb47612591c3b60955
font_01_sfnt_off00011478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11478 10424 bytes
SHA-256: 5fc1196c5ef452b8737e5157b7807a121e24304d3e96ffc2dc2d36ea3d479166
font_02_sfnt_off00012c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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