Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ab7dec6725ab3d…

MALICIOUS

PDF

84.2 KB Created: 2021-08-19 00:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ccb4b904424e9aafff1ed1bc5d268756 SHA-1: 37013d48be5e794bca9613145be7e3cb9ef631ed SHA-256: 28ab7dec6725ab3df9ca13f8a02f89a07511235813695069a8065746e3f20b0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The presence of 'utm_term' parameters suggests a phishing or SEO manipulation tactic to drive traffic to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pixomot.ru/uplcv?utm_term=libro+asana+pranayama+mudra+bandha+en+espa%C3%B1ol+pdf+gratis PDF link annotation
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd824821c2f---34464176402.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/44725746020.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba73526588---tiwubepevimoj.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/fesagusufowuxu.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/e0668dffbc571ccf28af34461810c297/watatojo.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7aeb31ff0---pinusolu.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/20339478588.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfac22edc03---vodikumawo.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/60b68b6ae3346d30b421c311ee3c9811/gemesirikulil.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077593b2f01a---44597523355.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/14238836799.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xizukasi.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610d587ab2a0e---89244032568.pdfIn PDF document text
    • http://hainfelderteich.at/18938737005.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/81321210258.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/r1lhcq59ai5dnt0mo7usb01sdn/96455656156.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/dinokudunifojogusebudig.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/rapamasimetuw.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/45009722952.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/h7qqkljvl8883sl1s8claqhrtm/detow.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701a81814f5---64897921152.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/3btsihkjvc04nqd7rmgtrsh1fl/86836246607.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/789ca9a6463ffda48ddad789368136db/malelaxowigewikoso.pdfIn PDF document text
    • 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_off0000e03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03C 11464 bytes
SHA-256: f87e13da305b20b542db246f21b1d92036d53824195beaaf465f0d66c6568a5d
font_01_sfnt_off0000fa70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA70 17712 bytes
SHA-256: 9a8cd54619cb11e359fbc8c827fec08644e4d3c9ef16df5f03b38b0fadce2c0d
font_02_sfnt_off00012735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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