Malicious PDF — malware analysis report

Static analysis result for SHA-256 a470f7b4baf2d414…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 03:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1afd78038f7cf7f9fff92e49a1fbf5e5 SHA-1: d4eb9a0889f39c0655071dadfa9c2e786f604330 SHA-256: a470f7b4baf2d414e9ccb72fa0ba6d45f8149d0d0a6d1d0583501fbc3cf2e7f1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms points towards an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://ahknchem.com/upload/files/67598732856.pdf In PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/jiwikuvagisuludiror.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/didojiseluvov.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/18833962572.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/xavuzuwexopomonavet.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/kudekanef.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/zaniv.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/kogapazoxomurumufuze.pdfIn PDF document text
    • http://termocity.by/pics/files/16677897973.pdfIn PDF document text
    • https://baongochoa.com/upload/file/fujizudilajaragafetet.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/gefuvefunuveziroxidubu.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4a6ec2f7d---lozisuganixovemutekopi.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/69691796300.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140218323ae8---banuwiwavopunipurekuzow.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/36221315006.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/18848426696141cb9779230.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/45573730171.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/fuzivukeligalip.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/77505154048.pdfIn PDF document text
    • http://sapthagireesyathra.com/userfiles/file/61770239468.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/21384792669.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16130653f4d3a0---rajimosigulapafivusiv.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612feb649063d---79781289601.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/59021802886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ml+with+cheat+apkPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/3227789232.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_off0000e0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CC 18068 bytes
SHA-256: 7d300a0eec63c0b5c1d066f9630a12b43f362f553b65edb1f08facfa8a39860a
font_01_sfnt_off00010f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8C 10148 bytes
SHA-256: f9d812c04ac8da744f96548c13cd09f54ca4e48e34906380f7fd5439a84ac33b
font_02_sfnt_off00012670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12670 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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