Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b61535930f1410…

MALICIOUS

PDF

84.3 KB Created: 2021-07-02 22:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5d5093d30e27633e206d627826ed178e SHA-1: 855e30720f9759d443f3cb41595b340a9a1330a5 SHA-256: 50b61535930f14105cca87b13d4c831e4f3d52a98c9f356e1d0722ec1a923507
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, suggesting a link farm attack pattern. The presence of malformed streams and ML classifier flags indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of phishing or malware distribution attempts, likely leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://studiopignotti.it/userfiles/files/fibepukuzagebojinofuv.pdf In PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/dedfcf5f88da0dbf40a4b24563848ac5/74904471160.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/tm8m2omvitl6035c0gua4da2r5/97464414782.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/49581854123.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fa2aca429---17381250331.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/18750450768.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/24271460301.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/41a46aeb18ef90c5a160cdf08c365762/lapujonebiw.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ef3128c8f---7206071012.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/55833399017.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46070b8a0b---50262900931.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3c0aee3842d1aad52cd242ab3f281567/4810042682.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609912345cb2e---59910184450.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700e86db7b8---bevifenoteluxu.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/5a4008ee8ec713b454fa52b0e35e22f6/zebonabulimuvatatenuvoxa.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/e9c71c450e69df2af899838ccf04ddba/rotireduduwividixuvodi.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/befovufimarit.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/e6ec600069a7ab961c5c763b67ec2c36/21181939287.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/34158741542.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16207323198378.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/75857380915.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/f0b2210a25001ba7650936feecee4d15/navuvijojipebedilixukadol.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/445e3364cdd4d2e65aba96aade81ac16/pejujeguzuzutevoxedova.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210601125951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=dimensional+analysis+practice+answersPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35C 10736 bytes
SHA-256: da70ef06ad51caf47ad05ef0525f715906008d9336b9530cb320943c788fbec3
font_01_sfnt_off0000fc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001142f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142F 18024 bytes
SHA-256: d9f569436ea7d69c895990f2b18da2016afbf10f8da4d93a783b6a395ef9312d

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