Malicious PDF — malware analysis report

Static analysis result for SHA-256 704d8d1f84b3acf0…

MALICIOUS

PDF

83.2 KB Created: 2021-08-04 12:37:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 57e4d0db87f6b4f7e1a3fcfb3a722077 SHA-1: 8ffa25cb446f48dcb4b15d883d610fe60ba5e4bf SHA-256: 704d8d1f84b3acf03b5f2be62c51073b340308dfa6efdca88b5b53d20c20407b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/e025f626d6e843dace86baef1c1a54af/90485310451.pdf In PDF document text
    • http://www.deco-interieure.com/userfiles/file/ropuxesulekajek.pdfIn PDF document text
    • https://rotterdampools.com/contents//files/sugasilafozurabejepijur.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/61894806116.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/jelekun.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/dt46pbdl535q17et9rb0n1nt2b/beritifarepafu.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/7alpkt28lsomvog97affpc4frk/36608266400.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-3/20210503215159881575.pdfIn PDF document text
    • http://ghefoot.com/fckeditor_userfiles/file/82763763912.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fd5b176c4---dikikixenuveteginidam.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/0ffeade2c4e9608d17cbe91e6b837ff6/65579733660.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/92058683070.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/4013233777.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/60150247714.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aefb945776---bilifer.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/21886658988.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16085cefa9dcd3---zelolafivebeza.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/rezaguzazabelupasudom.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///jinozuxenowe.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/abbol1ne4hasa3i5gkrulbv793/seriwi.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/siluvexawulikenoduxexan.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/dunusabiwewejoremanadigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+setup+green+killing+machinePDF 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_off0000dbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFE 11092 bytes
SHA-256: 4137f87a2e9183143dc3a9a2a1297878aed04fa1cb61ffbd95a660ca378e60b9
font_01_sfnt_off0000f5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC3 17748 bytes
SHA-256: 60d9ee6d2b7e0c8282aff5d77da695a610b47d98c5d35e073cae74f6402828ee

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