Malicious PDF — malware analysis report

Static analysis result for SHA-256 033d0a7c61b91113…

MALICIOUS

PDF

86.1 KB Created: 2021-06-25 21:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9dbcd3966604b0dbc826d4e17f5ea1b3 SHA-1: 7794b4d76cde90d388de5b74caac4e894bdbe644 SHA-256: 033d0a7c61b91113c8fdb05316c8be4601a7df9b0d774d6c8b2af9574bcfa98f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ytbozhuo.com/upload/file/262142476715.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b7caede46---zeloxuremukomut.pdf
    • https://activepymes.com/pub/file/31579941837.pdf
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/83137517154.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/5r6a0iml08uj6eqqf471as1c90/zezodatadavinixigojaja.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ebd41dbb0---43243420869.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16093f6799b42e---sexelurapokuzapifutowam.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00f9d23fcc---telisawowugofuvov.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/491529cd589fd85c4b423fcb8c071751/49414320294.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/6414898dd98a018d38ff6bd6fe243ab4/tololinibirew.pdf
    • http://espacioschillout.es/images/admin/file/69234785028.pdf
    • https://tenfci.org/userfiles/file/25156582379.pdf
    • http://dgjst.com/upfile/file/82794207073.pdf
    • http://maihome.hu/admin1/file/bobovejimuwonotuxubes.pdf
    • http://bobmeetin.com/media/galleries/files/52295651842.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e38b3e8b67aca4c93d20b4a0c9c9f0e9/12574210639.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607555d573a58---24273515792.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe175cea72---64130285207.pdf
    • http://mppscstudy.com/admin/usercontent/file/lugufomazasotetovabun.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c33e66a0c---xuvavafinavevowumirimuviw.pdf
    • http://drukarnia-skawina.pl/app/webroot/media/files/kisanavomev.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a448b7cd953---gozusodaxalidewagarixeviw.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/f5bde73e4634cb50c82bb42a2e66c2dc/83113983922.pdf
    • https://perfecthospitals.org/FCKeditor/file/ludefegab.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/6297c6ebc22961b421aa657f47dc02fc/lawukedot.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=chapter+vocabulary+review+crossword+puzzle
    • 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_off0000eda8.bin
41023c6f750dee43f0638c0556a6be5c18bc9b8d1bbce5ac7c392e55ad80cd65
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA8 11104 bytes
font_01_sfnt_off00010794.bin
068f595d51c398597ab0d28f2535212ded33c907ab0cccc6b30869ba991187d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10794 16764 bytes
font_02_sfnt_off000132b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132B5 16792 bytes