Malicious PDF — malware analysis report

Static analysis result for SHA-256 a59af380ac7ff489…

MALICIOUS

PDF

86.4 KB Created: 2021-07-03 21:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6925b4ff141ad39adaec69a9ba9c1d43 SHA-1: ac7cb9188ebb45d044fe11689b69216209480adb SHA-256: a59af380ac7ff489edcf4789e13a19f3ecc7885273f6b02a41998da2c02aa067
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple distinct hosts and a link farm pattern further supports its use as a distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://sasalidayanisma.org/uploads/file/tulumarevudemagunapeloles.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/1b0ac4f665d16b90f8c6d2e8507ac84f/wenatuzuf.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ab17bad60---92653229883.pdf
    • http://marinapogon.pl/upload/file/ragiku.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccf035d25c---gafotuva.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8226ea0b8---78000046644.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/ce07fb290c25c281badacf2b5065b71c/62730532135.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/hn2795mqrhh2q2agpkg6dmuq68/9335327142.pdf
    • http://asiavent.com/UserFiles/file///povokitaredejurotagekim.pdf
    • https://xn--z4qq44i.tw/upload/actfiles/86540626424.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe2f2343a1---wofobizadetevaxiteru.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/0e4a6092434ee8d7c860349b4a0e15c2/51997835916.pdf
    • https://obermeyer-modemarkt.de/upload/file/megebomabiwepokasolipal.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf6b25cdc2---16360381795.pdf
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/fuguvotododekugope.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/ec6a99c78f200ca200cb9a7b7ef7ab59/lopagobuvasavagurorununa.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85392e474d---dowuzav.pdf
    • https://standardpromotion.com/images/upload/userfiles/files/29500456722.pdf
    • http://aldo-ins.com/userfiles/file/92527573287.pdf
    • https://pasarantogeldua.com/contents//files/25889159937.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f98b1e363---24153893673.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/6748f7ac99588d1fb5626716cc14b31b/gowedozisezoja.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19d3f54b57---18586598700.pdf
    • http://0vote.com/ckfinder/files/25059290696.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/22937a913d59477a30f4d4ec96a66d60/fezetatemanetevobu.pdf
    • http://topas.lt/userfiles/file/10180129520.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=spotting+a+week+after+period
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eebb.bin
f3e571a3fe7a202194cb7bd34514caa91c45dd11b60421c94deb0c4f64464421
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBB 10712 bytes
font_01_sfnt_off00010762.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10762 16792 bytes
font_02_sfnt_off00011f74.bin
aa0c43c4c574e4d91f09737c7253f3189fddf745c87a36b8713de38af59f910e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F74 16612 bytes