Malicious PDF — malware analysis report

Static analysis result for SHA-256 12bfac31e7ea22ab…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 12:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 904b61a3e0ed29637c370d25c15bfe51 SHA-1: 78e0c66407518f7ca44f79fc1d703118e18cf2a1 SHA-256: 12bfac31e7ea22abdc7595786621c83113d2cb4428c844ba54bd516b1e1f96b2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised or disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic firings related to link farms and compromised CMS uploads further support this, suggesting the PDF's primary purpose is to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://irlanc.ru/uplcv?utm_term=where+is+alarm+clock+on+android+phone PDF link annotation
    • https://beautyyaurient.com/editor_upload/file/55547330769.pdfIn PDF document text
    • https://timminsrenovations.ca/file/3HpEtHYNT4RdSERy.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/dewelexufedelo.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/gulavelokow.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/30905019685.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/bavodunobixuliwajaxatoje.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/tixuvu.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-07-01-44-27-11.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161340a3665b83---96361698494.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/75243578033.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ec5e92f61---10113661228.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/51173811152.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/58675753280.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/87627970772.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/gizunuxejikexizirogamal.pdfIn PDF document text
    • http://mdtrend.hu/files/file/xemawo.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/nelapupakuti.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/xativiwezazenoximudure.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/diwoteragoro.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/57950835290.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/50752470415.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613268c5a0189---64099857068.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/33690632845.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7dbabd836e01d223c00664160708cabf/jexev.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_off0000d3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DA 18756 bytes
SHA-256: 79c1c6ad62f922273dba5c7d4a57a408dfeabf7892769be057d9d6d45874609e
font_01_sfnt_off00010481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10481 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C98 10764 bytes
SHA-256: 624e00c95295e7aa3669c4c4349410bfc13c81b68bfbafd078d3067bcc92675e

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