Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3fc0a6e86aac379…

MALICIOUS

PDF

81.6 KB Created: 2021-09-08 23:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5ca4b59a9dc627207ad8376c6e5d86c2 SHA-1: bdd3c283c45ca69aa8e11fd350b24e6b3ff3c7df SHA-256: c3fc0a6e86aac3794a3669a96ed7c168d0dc71b08a2df10b6c30b3819d477e78
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' suggests the document instructs the user to interact with the command line, likely to execute a payload. Numerous external URLs were extracted, many pointing to compromised WordPress sites or disposable hosting, suggesting a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://irlanc.ru/uplcv?utm_term=apps+like+apk+editor PDF link annotation
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec28d4bbc9---segaz.pdfIn PDF document text
    • http://full814.com/upload/files/tewosenifinoxisonigen.pdfIn PDF document text
    • http://hotstamping.pl/files/file/36031414910.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/gupidaginobasosu.pdfIn PDF document text
    • https://austarpharma.com/upload/files/bogunowudikefumorule.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/91707735379.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/31415922807.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/fumat.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137cf9d6bf80---95343327403.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/83711673019.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/loloziwe.pdfIn PDF document text
    • http://www.siposferenc.hu/html/36490305112.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dbeg8s2go970jv3ikfut7gi3j0/75531147699.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/wudeva.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/wisigarojesiwamasipevi.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/e34dc83a390987b712c0f5a313620bda/bupuxugi.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/79141477812.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109081428479885.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/71972772220.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/45141887605.pdfIn PDF document text
    • https://pmms-online.com/assets/file/numotoxebaluvakos.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/3765932546.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/95225829257.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/dabejavuzud.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/15567940718.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_off0000d811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD811 10356 bytes
SHA-256: c94edfcb45144a390119840f89af9f8e4f90e19c243449a958476a6704aec257
font_01_sfnt_off0000ef99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF99 18600 bytes
SHA-256: 9833336ec33a7d2365a616a4d34cec43af1397257eee15643f3f5e2612e6ee04
font_02_sfnt_off0001204a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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