Malicious PDF — malware analysis report

Static analysis result for SHA-256 88194a8deeb7dfb8…

MALICIOUS

PDF

125.3 KB Created: 2021-07-03 13:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 79a0a92495843d18913d2c9bfa35c14a SHA-1: 70c00cdf8028b18a0fc15793f8f4105ede0027fa SHA-256: 88194a8deeb7dfb86f54d45dd7870c22ade621ca78b7c5fd666a23e5628fca18
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous compromised websites, likely intended to trick users into downloading further malicious content. The presence of multiple external URIs and link farm indicators suggests an attempt to distribute malware or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/75849bcfb590f64f51493fa1360e31d4/12841365562.pdf In PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072401ac71fa---76571600572.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/putozosixurupesapatolam.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/nevojuvebewaputuxenivap.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082219245fe0---52995957778.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c70dcbb2f0---rizuvilofisipeviru.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086b5e24eed0---13864242573.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/47071645634.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/up8gmst66jsqcf5ng7ocek4ula/98728458875.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160865b1e4ce76---8476548493.pdfIn PDF document text
    • http://bociany.sk/media/file/30133979707.pdfIn PDF document text
    • https://avenue102.com/uploads/file/samafupegof.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5f5d8befc---siwevunukuto.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/75950907270.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607496c9b0de6---mujarikewejuj.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c846548521---61042375419.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/8cf8caf698cdc89187967bef4e6855f9/53570795646.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160834ecbc25b8---10780501447.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608709e70ea72---70522173467.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/22779629860.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/49236171338f5e324eead5cd05e0f5cf/41533369477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=6th+and+7th+books+of+moses+and+the+magical+uses+of+the+psalms+pdf+downloadPDF 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
stream_002_off00016a7b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16A7B 18588 bytes
SHA-256: a484a225b837723f55bdb17603ae11b0851fe1200f7192a1b4740bab3abd2893
font_01_sfnt_off0001888a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1888A 11504 bytes
SHA-256: d9f7f7757d03b7b483bc2a21b7166b6728bc9619bc45340eefd87a8282cc027a
font_02_sfnt_off0001a349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A349 16624 bytes
SHA-256: 5353839f923f29e93d3f7ec75814015d7ba47759919d1da3cc7fb219fea332d6
font_03_sfnt_off0001ce83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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