Malicious PDF — malware analysis report

Static analysis result for SHA-256 7803c88d0a962a72…

MALICIOUS

PDF

85.9 KB Created: 2021-09-09 04:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 14ca7431e054e0bcc0862b6ba6d62c8c SHA-1: d00a9871c07d5f271fdacca4bcf5f5d7646f933c SHA-256: 7803c88d0a962a724f29ab4095cff0300e4bed7bd52d458e1227bf7a300b2ad6
176 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of a raw IP address in one of the URIs further suggests malicious intent. ClamAV detection and ML classification confirm the malicious nature of the file, likely used as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://gruppocreta.com/userfiles/files/wikalad.pdf In PDF document text
    • https://tatvan.in/userfiles/file/sululopuvabuwen.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/zerazazisigotejemogu.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/82197950292.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/17178111720.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/78828144322.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16133e3890700e---bazivobum.pdfPDF link annotation
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613924a497597---38418746963.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613054d5dc73e---4553048334.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/78238782008.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090204220254.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/pevuzufetopajomevufop.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210902_102518_126.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/55566144685.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/18402802673.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ivuxigemuluzujemuripis.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/46506962576.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/52605971049.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/65140299434.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/99067149872.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161364bad80813---xodijadak.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/korawuzipagiwepetifexota.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/takelalaxuzibovededepomin.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/44043583475.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/pizukajesalirajasadu.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/76632497507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=android+vizio+appPDF 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_off0000ec2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001043e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043E 18264 bytes
SHA-256: 16de5256a073110fa6354e7e2f9468fe1bddaa1e816e1281ef8458b52c8a800d
font_02_sfnt_off00013359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13359 10048 bytes
SHA-256: 8536cbfae4d068519800325944f6b3baf2d3a6794dc7cb880181703028058806

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