Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9e4e9d62674093e…

MALICIOUS

PDF

81.9 KB Created: 2021-09-03 20:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b4ed7d7226d52cb7bc5313bd6084eb6e SHA-1: 0a61a8f807c603f709317fc7f750323ed543fb72 SHA-256: e9e4e9d62674093e5e23949fa02e51fe05ac2910e93297b48ddf8bab6a0af5ab
156 Risk Score

Malware Insights

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

The PDF contains a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://ladangmimpi.com/contents//files/51331825873.pdf In PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89347859736.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/fitem.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b206f0c5d4e---10559579889.pdfIn PDF document text
    • http://altus.pl/userfiles/file/josujivegigofenupu.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/zurogiribonuzi.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/712ec75b2d23cd445df698e09f99c5e1/wanolupusa.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607072b446c08---vinisejubururig.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/81004811170.pdfIn PDF document text
    • http://gdaniec.com/upload/files/95756377389.pdfIn PDF document text
    • http://chinazzjx.com/d/files/mawoxewowifamibedov.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/xesezazozuvasutifen.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/zifudibalul.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/bixamijirifaxirinurot.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/84971601032.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd6802197f---janekizelivuvedozopumiv.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/18277363937.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/17146175735.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610b8c3078925---vimimomolovatibet.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5dbe5cc40---napax.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/jikafavexobur.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/c9dkau1j3tukdu2c3take8t0cl/difuzalufijifasedanomiseb.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/newagozofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=free+pdf+editor+windows+7+downloadPDF 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_off0000dfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAA 16072 bytes
SHA-256: f1801e373901c51c1d6bc35db7ec34b244669ba3aa85776b6a00d0bf1dc5d635
font_01_sfnt_off00010922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10922 10604 bytes
SHA-256: 76468c5e3278dd9a522d49156234731f9a53bef09574c19b5d1d9831394b4237
font_02_sfnt_off0001218f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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