Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d88540d9ed8318e…

MALICIOUS

PDF

92.9 KB Created: 2021-07-04 12:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b7e466d91bc575ddbeb72aeac5be421 SHA-1: 2bd18cf50973db85730b05f5eb2afcbfdcc4d6a8 SHA-256: 4d88540d9ed8318ed6e3611954ac224f726552496a0b9f647a5775046954293d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to phishing or malware download sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://abwingssuffolk1.com/uploads/files/sodifizugudikete.pdf In PDF document text
    • http://icltindia.in/userfiles/file/71165742112.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/7cec0caed03863137f7afed99a4da05c/kipenalexesezu.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074461e5a0ac---16521761205.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/dobogijavujoduf.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/38426613258.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/vn978actmdqvvu2s2oar9vnku0/jawosawoxuvuduzen.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/jarelu.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/92fbd762d76be789268d5161a31e3e1a/weluwolazitexisug.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8de5f05f2---95954499828.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc5770d0e2---lilurupor.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16099f1c3edc85---gozokozononogifis.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/90149198124.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a170e6385f5---24033866959.pdfIn PDF document text
    • https://auto826.com/uploads/files/rusipowi.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d27fcc69c3---626991936.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/wunosigoda.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/zapawapikag.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/nugusegonada.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/repiwinanazo.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/68339188035.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/kanadodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=fly+me+me+to+the+moon+lyricsPDF 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_off0000e6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D9 18180 bytes
SHA-256: 3bb234e98fbec432116b177842237e9f5e04fcb2f4c3cad036aa386ce8f5e3b3
font_01_sfnt_off000116d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF0 10424 bytes
SHA-256: ecfe877f4a652711d62a70648809c0a59ad7acec5146f18cd227197e85b3bbc6
font_03_sfnt_off00014657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14657 9376 bytes
SHA-256: ef472a5c0a8f86ff1eba6bb936fc0d2235b01d7c7ea946a47cf93e995f9ec97b

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