Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e72d3b9744f61c…

MALICIOUS

PDF

88.2 KB Created: 2021-06-29 14:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b69c9501f984fbaa408bc5fee400a0b2 SHA-1: 2c97c9d4e397b1f06c0d504cb90fbb7656594000 SHA-256: f5e72d3b9744f61ccbd40b13ecdde7b7ff422851b2dd7e71eda371189ec3203d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and links pointing to potentially compromised CMS upload storage. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cd78bdbfa---88921982239.pdf In PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/nujaxegul.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e6634f189---49381036293.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/4f596c04e14bba3a09d4e452aadac72a/32720129580.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/69769631748.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/640b675191f99bce7eeaec9eb77b4546/pudinezolodatiwosijolatuz.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/gpe9j6bqfeg86o9ohbm3bg9ghi/juxixepezepenisujafoko.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/7849cb6fe4250f5e814b454261181e54/84961556038.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/10329992344.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/294973705.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/96f2173f81229e238612691de5c1b1e9/13556251532.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/bowoxalafanedobunulavem.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12a3e59c05---sewikivojozumuk.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/61579708841.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/t4c8g995cusuk6uq4esvns9ekm/54535550682.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/wigemotesajujowoxajub.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877b207cf4c---50377292285.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a6cf1335e---97540350680.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/37a9423a7a06302f38a631f866b52e59/bibugano.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/rs8k2qkd5h7v5j8lkmv16i2pr1/vomagapawalepupiz.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/c02c7dcb958a90a261f736e2c8ae4081/diduvav.pdfIn PDF document text
    • https://serka.com/serka/upload/files/rawavisezamumirijekiwum.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608369f37c1cc---fidutogufaxifewi.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/durejifafavugobavegovon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=reif+statistical+physics+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EA 16948 bytes
SHA-256: 2d656183fe95ca4637214d97919ceee01c7a5f397be7708fd8a006dbe226a6d5
font_01_sfnt_off00012341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12341 10552 bytes
SHA-256: 060debcd31c6396901fdb77b075c712e52b901574314ccaa993f23b97624578d
font_02_sfnt_off00013b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1