Malicious PDF — malware analysis report

Static analysis result for SHA-256 78bd995ae9e418a4…

MALICIOUS

PDF

87.4 KB Created: 2021-07-05 17:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9acfc7d54d4b60a3ca760ea6de88a627 SHA-1: 13a3e222d532cb97ce669c3989322082ee8047be SHA-256: 78bd995ae9e418a4fceb005c369378e02d9aebdc013830fead52036c08e3a7e2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of a 'download' lure further supports this, aiming to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becc168365a---vutorale.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/3aba023a273b9461ef357b1d0e7aaeea/vimupem.pdf
    • https://alihuata.com/userfiles/file/dusoweta.pdf
    • http://krossi.ru/images/content/files/11684324146.pdf
    • http://bluecars.pl/userfiles/file/xizaruradevipito.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/afe447fb28fb88961a132fb3719b028e/29122576817.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96c1bcca93---20509457484.pdf
    • https://sanxuattrucauthangkinh.com/Images_upload/files/66108832764.pdf
    • http://reutlinger.pl/userfiles/file/20258228365.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9223c3515e---rolujava.pdf
    • https://www.profiemg.cz/upload/ck/files/78236798232.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e21d70496---nipuzapu.pdf
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/73881889735.pdf
    • http://berkeleyhigh64.com/clients/9/99/99a482d4bd0dc5522cc24ea7f8204a07/File/vufutiroxixe.pdf
    • https://study-abroad-travel.com/ckfinder/userfiles/file/bujogogilufukorutirem.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/32317bf1f2526b5cd34725cdcea7d70a/52102625846.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/0d6db911357574d3b249d198c4740333/326516732.pdf
    • http://rollfactorytogo.com/uploads/files/39378393502.pdf
    • http://bigxra.com/uploadfile/file/2021061114004573499.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/d8b371c8f88490f6ac34f906aa570860/tudumuposonisipinanatamiv.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=download+movie+under+the+dome
    • 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_off0000f415.bin
4324f9a88f203a41d9f5f34aad4de5b321a3bcce0f340fd6af70d6efb7b61a68
pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 10596 bytes
font_01_sfnt_off00010c11.bin
189e8ae1586871f2411d5480b8c1e5a4c0edb440bd548d241c62e68d1b25d62c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C11 17132 bytes
font_02_sfnt_off0001388b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1388B 16792 bytes