Malicious PDF — malware analysis report

Static analysis result for SHA-256 c270fd026bd11dc6…

MALICIOUS

PDF

79.3 KB Created: 2021-08-24 20:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 161dc31040060059cb44408acc39211e SHA-1: bf0c4006859c437b8ac4ef6ebdd018e2495569fc SHA-256: c270fd026bd11dc6e40d624f51413c0d5d6ffa0d2c3f37e28025b314fbafdb20
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and ML classifiers. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or potentially disposable domains, suggesting a link farm designed to redirect users. The presence of PDF_URI_IP_LITERAL indicates a direct link to an IP address, which is a common tactic for obfuscating malicious destinations. No scripts were extracted, but the overall structure and URL findings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609605a01fa34---98904348337.pdf In PDF document text
    • http://stalmost.pl/userfiles/file/10968070001.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/kaxadixopivub.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c48392888---nitaronefafo.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/lanedorukolu.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/218518743.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/65219034709.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608828cd989ec---vesufuwezifunefi.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d449c131ac9---wesubujugalokesoxabuzu.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/17725616230.pdfIn PDF document text
    • https://amblamy.ee/upload/file/49296305427.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/15721471847.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/17888466384.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/8d0755e3f858d3433f71ab70140c2b9a/jetusilipuzugemewe.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/18674840390.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160766d5d1541a---18683270701.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc0238a12b---movabaresugefavutawivi.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/5039835288.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/08934f5fa2710f9606cd37f9c80cacc5/22164236318.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/fd544cab5ca35da3d61ba02747a5ffa1/40479978976.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/gijuneviwosegudemusu.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/63432152221.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/patuzuwevekiguvowu.pdfPDF link annotation
    • http://broadgatecapital.com/userfiles/file/31468634356.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=555+astable+circuit+calculatorPDF 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_off0000d4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DD 10396 bytes
SHA-256: fa5a0d8bccd5587427dbc9608e3087c3942e6cfcab11a6ef35ae9f771ad6fca6
font_01_sfnt_off0000ec8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001049f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049F 16208 bytes
SHA-256: 34e797e8291f4706ef430e790a8eab32086c8501d6092aa00276f9e9f199f2f6

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