Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc4a81d240ff047…

MALICIOUS

PDF

74.6 KB Created: 2022-05-03 14:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2022-07-15
MD5: bd1bf3402a1a687f7399a936e6d30080 SHA-1: 5cffef686b87d80f156593ae88e5572876e6d18c SHA-256: afc4a81d240ff047d4a0cd96ad801f9a1e72e3ec2c426222b97a6117bfd9468e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users. No scripts were extracted, but the overall structure points to a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cafij.co.za/YmrXLWy8?keyword=letra%20cancion%20dejame%20que%20te%20cuente%20lime%C3%B1a PDF link annotation
    • https://kabelkyaobuv.sk/editor_uploads/files/90710584361.pdfIn PDF document text
    • https://pegujerexiwusi.weebly.com/uploads/1/3/0/8/130814209/toxesugan_gufonofuxur.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/c7f46cc9700989abf583cbce92ebee4d/xomubejerelugonak.pdfIn PDF document text
    • http://abdobson-new.simplywebeditor.com/site-uploads/91345168315.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/xuxezetizepu.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/2399594702.pdfIn PDF document text
    • https://xefixosusivepik.weebly.com/uploads/1/3/5/3/135392558/8318179.pdfIn PDF document text
    • https://nikalakikezune.weebly.com/uploads/1/3/4/7/134753818/8449d4cf085.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/21962132115.pdfIn PDF document text
    • https://jotisevixenitu.weebly.com/uploads/1/4/1/2/141258578/gabotejefowul_tumux_nanilegixek_texabisaneko.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1621513cc2b881---juwuzakaviwotilete.pdfIn PDF document text
    • http://www.boonjit.ac.th/backoffice/ckfinder/userfiles/files/keduwokanoboroli.pdfIn PDF document text
    • https://zulevoto.weebly.com/uploads/1/3/2/6/132696122/simajejaxuvog_kemiliwoted_pobobijanololud.pdfIn PDF document text
    • https://kejopawilut.weebly.com/uploads/1/3/4/7/134709951/xiwaguxuj.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/daxoliwewapabameziful.pdfIn PDF document text
    • http://omegabg.net/media/ck/files/lomazibuzogitalinikoxa.pdfIn PDF document text
    • https://pobowapikojuga.weebly.com/uploads/1/3/4/9/134903403/69a5c.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/162018335f2a85---41777286932.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/162433c481cf17---menulixevugoz.pdfIn PDF document text
    • https://kokobeze.weebly.com/uploads/1/3/4/6/134605009/cf78c3d5.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_off0000bbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3ED 17940 bytes
SHA-256: 56801ee7814530647e359a1067afddbee26c2b58f5436e6afcd2426e68674599
font_02_sfnt_off000100a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A8 10904 bytes
SHA-256: fbaff9f901a83180c1a84e80b34769a682e50d80d37f31326720f0620d220401