Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1a42af73a9e194…

MALICIOUS

PDF

72.2 KB Created: 2021-09-25 22:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 12e2529e9e0d40aa4c521a373b635a16 SHA-1: 9bc816e90f19c6b264735b939a2e50a96a1f00b1 SHA-256: 8d1a42af73a9e19419ca3ee09672268f870c7d85b4e74459f294df8958ef3808
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and link farm nature strongly suggest it's designed to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://myxroad.net/upload/userfiles/file///25553302108.pdf In PDF document text
    • http://dylogistics.com/userData/board/file/jujamix.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/34280115069.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/16249038123.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ea2b9454a6---62049248731.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/godajulajugofe.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/bebakuke.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/weguza.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/tesijimobixeboxalebefukam.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/jejajuzexuw.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/53892016273.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/31013487993.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/5844834455.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/fevokupofokepurelog.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/fejesipidagokojepuse.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/dexidezasegataka.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/92883068634.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614badd3cc03c---vobowatakelutokot.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/29361399655.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614832eada958---jowelakufo.pdfIn PDF document text
    • http://khocabien.com/uploads/files/gelakemupixifidakox.pdfIn PDF document text
    • http://njboyuanchem.com/upload/files/nibirijawufafigubawan.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/38162149013.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/81372210325.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/ee9807418e6ff1ede0ca40866cdc99e9/zosedewokuz.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613685052249d---kilunuxubaxupuresuregaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=app+for+marathi+typingPDF 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_off0000b5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F9 17836 bytes
SHA-256: 2708633edf748665e8f7a4ffd25cf7c3eb90bf16a95d7a8054b6f65002f0f704
font_01_sfnt_off0000e395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE395 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAC 10552 bytes
SHA-256: 233bd2e41f18ad81d75782a23ab24e56bb16d8f355b4eb84f9ad6cbb3c3447ca

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