Malicious PDF — malware analysis report

Static analysis result for SHA-256 122d05c4a88f0bde…

MALICIOUS

PDF

75.7 KB Created: 2021-09-18 13:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8d2ee8d75daad22f80765d99f3f16158 SHA-1: 37a57cf104f17144fe988be08b24f241617b2d0d SHA-256: 122d05c4a88f0bdea517c219beec0cd4a7f45e04a9300921e52d23c6a9476bf4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://drafthe.ru/uplcv?utm_term=how+to+connect+android+tv+to+wifi+without+remote PDF link annotation
    • https://flomogroup.com/upload/files/60570381110.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f6d854a96---rozafizikaveri.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/xamak.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/8d3df1f0b00a17f1dd064ec3ef893e3b/wugezat.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109012221146304.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/gibivo.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pufitoxatani.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eed150fbbc---38871513683.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/62803557090.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/46620767003.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/8af9b4b32dfc6b1c7f7b7d6115b7a9f9/7564902283.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/vujinuxil.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16138db6175b7a---79411351650.pdfIn PDF document text
    • http://epicridesnepal.com/files/23924406283.pdfIn PDF document text
    • http://sjhtractor.com/d/files/70790011255.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16134ce48c8207---75757606624.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/feladaretu.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/25042598166.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/21695588812.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fb76d2759---zedebajilotes.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/kolirikejuruwozum.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/10718758309.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/pesufobilugudobusifa.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/somewogukazemexokofapip.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/64f6fc71586eff544c7546218c7de3c1/54326613792.pdfIn PDF document text
    • http://wsm.hk/images/files/gojonenagubexovajirefu.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_off0000c5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D4 16296 bytes
SHA-256: 66db0152a3ae60c65bb41f10fedfaf90e9ac6332e9152732a4469e0e8b6a110e
font_01_sfnt_off0000efb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 10772 bytes
SHA-256: fb38455a5307dc7279ccfb89ab8368d5c288606f847ece20213e6d0e6aa17571
font_02_sfnt_off00010848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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