Malicious PDF — malware analysis report

Static analysis result for SHA-256 953d961d575257b2…

MALICIOUS

PDF

78.5 KB Created: 2021-07-09 08:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd919e455a0de84fd1fd8a42e95e7b9a SHA-1: fe97e6bf790859feaa3258e681ca90ff94d49a47 SHA-256: 953d961d575257b211248c04145ab58b051b06677d504808bdf67741f1244fcb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. Several URLs point to compromised WordPress sites, suggesting a pattern of hosting malicious content on these compromised infrastructures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3df27ea39---11002777709.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070279d80bef---buvekezigazutiz.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/cmlj606e6debehnlvvttav0rhg/dizewu.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b96362ab9---62376937875.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/fbcf0ec6b1bd40ee2185503b69f9428d/lasamajaxamixupenazix.pdf
    • https://my-natural-style.net/upload/files/nipabuzumeso.pdf
    • http://booklandbooks.com/userfiles/file/33975616390.pdf
    • http://autofactory-jin.com/js/upload/files/34810591101.pdf
    • http://0vote.com/ckfinder/files/sifinifunegupokonozas.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/9beea4c98fe14a834a16ee39cd4783c5/62999459321.pdf
    • http://kardelendalgicpompa.com/uploadfiles/file/pavabugumatamaxuzadose.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16083534a8cda5---49997922687.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/82ddehqpiqdjnbvvviviqtki6c/64970885152.pdf
    • https://cahayaapi1.com/contents//files/43181277178.pdf
    • https://foundryindia.org/userfiles/file/70518283891.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/7b87bcadebea8e0f3208a3ec2816a30b/xafegemamimileseso.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbc2b82766---vipogalikoxiperatogegeno.pdf
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/92123091531.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609956ed5a6a0---86852819699.pdf
    • http://jshtextile.com/UserFiles/file///68941690965.pdf
    • https://morabia.fi/images/file/58414833441.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/2b9dd4ac167f04b5af88dd35d1bd6b5b/70744245016.pdf
    • http://jarosi.hu/files/file/pigefes.pdf
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/70483392856.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+merge+two+pages+in+one+page+in+pdf
    • 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_off0000d01d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD01D 16792 bytes
font_01_sfnt_off0000e834.bin
5f4ec4d8e681eb6d2c17a6376f3a0c35d80262ca9fc937135163991adb507fc2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE834 10872 bytes
font_02_sfnt_off0001011e.bin
227136da19d9abb2cb0c484a1e567b7d24572e2f9eb8d5f7cc0f0a529d0b54f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1011E 16600 bytes