Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f8c1a6a1bb694f…

MALICIOUS

PDF

73.2 KB Created: 2021-09-07 17:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1ce44959cee3379bf718c7c629904bff SHA-1: 0ceb56f614de384ddd76cd2fac75d8d1193e6437 SHA-256: d1f8c1a6a1bb694f185a53ee8334d9beef3fadca6fe10ca7a1b3f88a9e175c45
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous links on compromised WordPress sites that point to other PDF files. These links are likely designed to lure users into downloading and opening further malicious content, potentially for phishing or to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6e6e68bc0---talerokiromojufoguxufojel.pdf In PDF document text
    • http://artospace.com/pics/file/67427764716.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/wokizufelama.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/1078087469.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/90709227098.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/rasizomeboxuri.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/59c7017cbdfcbdb999fe006dc4b5cfcd/givezekuloluzejexenujasa.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/48907706667.pdfIn PDF document text
    • http://drticket.ir/basefile/drtiketcom/files/xuwawele.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/juxogomig.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/difevojenutiberafetolufi.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/24617446169.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/jotisekakixapelibufut.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/jexuxexaxib.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/botiwugudun.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/sasaxitomup.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846c2bd5bfb---32314855204.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zexapotememakukewiwi.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161217bc5741df---vekuxonefez.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/mapalizubegubadabuki.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/zaviwirabivofitabumitez.pdfIn PDF document text
    • https://nexusmediation.nl/files/mefaxunesepujudafedibe.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/bezerewibebawasowoxa.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/65407918975.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/18706638608.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611d629cae003---67240494513.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/69694063323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+gathering+kelley+armstrong+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_off0000b760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB760 17812 bytes
SHA-256: 5da8cf5dc57aaebb5806441597ec2c6eb3ac30a98c9a48ebf707d0a9b8a7c5ce
font_01_sfnt_off0000e58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58B 11116 bytes
SHA-256: e0a68237d4af9e420c4c32b35597890ca813cc55f529ef8fe3e3b65cb1ac2423
font_02_sfnt_off0000ff1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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