Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d557c57a81befc…

MALICIOUS

PDF

87.9 KB Created: 2021-07-30 18:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ba75fa0ec5d66b3c27c71b8f845ec93a SHA-1: 6cee15a551fd5535d9ad68c283bc3c272cf90e77 SHA-256: 41d557c57a81befca9962242bd18062b39d13184e01982a2e91b45c37cfcf85a
196 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CLICKFIX' heuristic suggests social engineering tactics, specifically instructing the user to execute a command via Win+R or a terminal. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt, likely leveraging a compromised CMS upload link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/77823f95092b67a753ca5de2fa4c6dbb/tezeji.pdf In PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/bowatojegobipatavisotosow.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/42374571261.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/5341e7ae8ba1f351981cd2cdfed1e146/81072598779.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/444f5250ce7beb2c8525ea988b798728/dazava.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/kuzulojugomutefifetojo.pdfIn PDF document text
    • https://pasarangroup2.com/contents//files/82421411856.pdfIn PDF document text
    • http://mega.kz/media/upload/files/92213447486.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/839252d17a064bba0855b41638fbee51/50972802487.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/wiril.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d19af3aaf---37264151240.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/fufiwuxafisafolurivew.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/hjsim0n6kd19fsgsi4k1kuufb0/rowek.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/letiz.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9969d502a---90112628470.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/f0350a89baa8ea857e6ba4c75582df84/kisap.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160942c67ac60e---wopitogotezusevozeki.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb4148be5e---34500998309.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/ce4a144ee06e2d03692246831e68194f/mejinuta.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/lc3nbltdm9c83md13hb318ha56/webogikikufuwa.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/66138727703.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5336987aa---82868078842.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4695080931---gupimezefutejewopobaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=descargar+serial+para+office+2013+professional+plus+gratisPDF 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_off0000edf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF7 18584 bytes
SHA-256: a5950aabda301af9511eaafcc3e59636a2160da6742a52b67059ea893b2b175a
font_01_sfnt_off00011de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FB 11220 bytes
SHA-256: 77430544c38bfcf3982f96f0aa4c5cdaf9310e731ac03eda4e4c9e90ea1f6b6a

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