Malicious PDF — malware analysis report

Static analysis result for SHA-256 0879a24a0b08d2f9…

MALICIOUS

PDF

87.7 KB Created: 2021-07-04 04:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 81fc5ed382bd15628f6ddaa6cc425d9e SHA-1: a2ed7dceb294560d90d0edf99f6017972ee63762 SHA-256: 0879a24a0b08d2f944672e95179d06f19d0c9fb49f1c65f27879d8540dcdd466
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) is a common technique for executing malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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.
  • 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://cyuanmei.com/userfiles/file/20703170399.pdf In PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb44b1b04c---44464141123.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/23705542484.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9af4108787---50815805122.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/617bd7451408f1cca33982c74259bd65/89110001035.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/r9aufig9j70qo1o94r6tr2mg06/zodunazeripesowizewe.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1b9256fb4832e7ef6b9f2110a117ec53/22064729921.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/dexekosilepijeg.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/n0qcu5riljkjkr6m7ummtuoda1/leloze.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/33233639504.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/bojexoloxatako.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/tizuvorarinepan.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d289869d94a8cda3b7598a9dd8d00fee/vugaxegexogokolifomenenoz.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/pikorot.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16071b67276d7c---sotiguzul.pdfIn PDF document text
    • http://falerisztika.hu/tmp/72890574124.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/buzosovomovopiruvomidadu.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/83fc01fa947c38c1f35a9cc2a8776137/86251844110.pdfIn PDF document text
    • http://jngf.cn/files/file/lerotazizavofevarira.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/gomesonerede.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e18911dec9---25409883.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/83142960118.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/kovejujodarirokoxirujal.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/f8238ced78fbefd64ec4f104b0f86906/14937454175.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609c113548ce8---81700422575.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/88225087401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=aqua+regia+is+a+mixture+of+concentrated+hcl+and+concentrated+hno3+in+the+ratio+ofPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FC 16100 bytes
SHA-256: 505f1f16fb057e2a34e7666bb0a43a50f2e0b7bc0033e59b70183295ac12d2e9
font_01_sfnt_off0000ef39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 11424 bytes
SHA-256: 1e688bfd9607aef0c78a1b7f9423f2e5e19dae58d273abf88abd957be61cfa69
font_02_sfnt_off0001098f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098F 17892 bytes
SHA-256: d7530e82032a622f3d793bd7c608f265fb1d315757f1f8c2b8163b935eb355e6
font_03_sfnt_off000137ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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