Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8ab1331e120a25…

MALICIOUS

PDF

76.3 KB Created: 2021-09-03 13:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bab25703d2034aeca9adf09c75cd0dff SHA-1: 5186ee08dbcf060ca10bd2a0e82670d79a352504 SHA-256: 0c8ab1331e120a256c61904875a4d505985f300abf0c3b6988acdb8586a4e0bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm hosted on compromised CMS uploads and presents a deceptive download button, suggesting a lure to trick users into downloading further malicious content. While no scripts were extracted, the presence of numerous links on compromised sites points to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/dca2d8c808184eb65d4f73dba442c46c/monisabimupudebobido.pdf In PDF document text
    • http://dade666.com/userfiles/202106file/2021062912283270554.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/1ci77f4jns3m61gltor4lar7q7/feworilulafewawako.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e739086292---28477777619.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/motesomokezer.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/45651510999.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/46862305111.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/92023417840fce10dd61382cea723487/96371331403.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/71383523964.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609656f5bf63c---levipakonov.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/16548397067.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/3e8946856dfa26a1604021f8cd152f40/56563167741.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/poxerekumekogalosikoge.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/66778682139.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/90739257598.pdfIn PDF document text
    • http://effekt-film.de/files/file/35242464407.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/40705102182.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/jiwuwopodibupede.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/57503712914.pdfIn PDF document text
    • http://rld-carbon.ru/file/87878014160.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/c450d16d7aa0eca5f5d781e42fafe079/1063771373.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1db2e8d645---tigibixasugisamizej.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/84027993523.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/dawej.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/serirom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=polytechnic+civil+engineering+syllabus+pdf+downloadPDF 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_off0000c483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC483 16936 bytes
SHA-256: 23ff8fc9b4f15e462ac8f71def4f8fe73d099ac13b23eb4048e457abdeacdd68
font_01_sfnt_off0000f0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C5 11404 bytes
SHA-256: d939acecea70d06e669685062ab7eb41f0320e9f00a5591c2a660d63537f9d27

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