Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af7e7cf8f2d8ecd…

MALICIOUS

PDF

79.7 KB Created: 2021-09-15 08:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cea9c658c784c0b6ef1478762e069ac7 SHA-1: bfc3ecdfc2bb9c7e982a5d95fce45a86270c2682 SHA-256: 5af7e7cf8f2d8ecd329e7354a0759100dd86f32b021fe621b93adf41dd8b2096
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The document body is heavily obfuscated, preventing analysis of its direct content, but the heuristics strongly indicate a malicious intent related to URL redirection and potential phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pistant.ru/uplcv?utm_term=best+slow+shutter+app+for+android PDF link annotation
    • http://prplus4u.com/ckupload/files/29842643025.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/18945016678.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210911014944_me7is2.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/gewin.pdfIn PDF document text
    • https://timminsrenovations.ca/file/a4qZAElD7Hcpj7RL.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/kanadoril.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/jodawavudafiw.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/10645588426.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384dab51178---17000484897.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/37704337987.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/vujupunawipaxejor.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7e4bcf486---wokubebamoriniwivat.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/sepidogupi.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/gejekada.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/43057832213.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/figimevazafofegokibenu.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/wureregexorufatamudapizij.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/pediwudiwafowopu.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/30020492921.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/71989670547.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/65393904740.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614166e107c07---85552682708.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/linifod.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/pezajabaparuliteneg.pdfIn PDF document text
    • 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_off0000d26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26E 10836 bytes
SHA-256: 834e7d9b20e753c96326829c600fb3bd06bdbfe5004a8dbb5b059742a191f6c5
font_01_sfnt_off0000eb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001038b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038B 17364 bytes
SHA-256: 61d372deb4a6e05f024872acd05eb6ed885e5f11332e2c992a7572b248fc2f30

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