Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a1c70dfa302526…

MALICIOUS

PDF

94.5 KB Created: 2021-07-20 21:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 31e61b4564f1478f85afbb3481831172 SHA-1: b57f090653892a0d0a5fec6f87fb1d2e2b5a42f0 SHA-256: b3a1c70dfa3025267e27573ad762585bc73bc60a61ea388caed8bdfb22edb599
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to link farms hosted on various domains, many of which appear to be compromised WordPress sites. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b76893930---52898648798.pdf In PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/b93f27adf3da3edfee32958bd71cf77d/pavumovilopuxatibav.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/jitokukitotopabasukesi.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/sirudasokigu.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae052d3748c---93037544066.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/29648444090.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdeb0dd697---binisadanupufet.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090cbedcd030---5189957401.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/42323760795.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/30742561268.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7550ee98e4---14197162852.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607a301735f9f---fiziduvax.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/20921482943.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/691841a59249b8ff32fe10c869f55fc3/jexuwelerixekukezawo.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/84566804257.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160860719a6956---navifuwugojunav.pdfIn PDF document text
    • http://arlingtonhigh1959.com/clients/863184/File/wavomuwabijapebuwodokuge.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a18a5ba87ce---95508056792.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16096c9ba25ebb---mewojekusigezinovoru.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/64843829943.pdfIn PDF document text
    • https://atl-50.com/files/file/65022939157.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f194686e94---78628162120.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=best+sailboat+for+single+handed+cruisingPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB6 19252 bytes
SHA-256: a5bedc159fba5cf92b773f8d9e565fb74f796aaa0f59ca115107b8cfd44696a0
font_01_sfnt_off0001315a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315A 2064 bytes
SHA-256: 5221cc56e96b657ff7c15f49bf1fbf1b5222e15cd7ffd769ce953162a3e53832
font_02_sfnt_off00013a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000152b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152B0 11048 bytes
SHA-256: 9a970e9740a213bdb1defee01b53db5ed2d4763651b48ccaeb424b535857ea56

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