Malicious PDF — malware analysis report

Static analysis result for SHA-256 7776756ffa33c59a…

MALICIOUS

PDF

82.5 KB Created: 2021-09-09 13:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a7a817e645c5c4b4465c4437b43e6693 SHA-1: ecb58687d17e966dc2afde630a08a0ccab66ad84 SHA-256: 7776756ffa33c59a9129aa5e07b512653354d5bd359ce6b27bc9fb1ad8661c30
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics point to a lure mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://music-group-store.com/upload/files/56947322679.pdf In PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/bejosinozejejalu.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/41975762903.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/74651786107.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/91010590072.pdfIn PDF document text
    • http://birdwatching.sk/media/file/43424128460.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dbd0bb78b---67319711455.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/zonoposeb.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/8609752092.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/lunusewujudulavadalufogo.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/wabiwabafusadopowuxawuxe.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/domf882ufrh24kegc81spdmmp2/11366237113.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/duborafofogarida.pdfIn PDF document text
    • https://epiphanych.com/images/file/dubopusedolupojoperusuma.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161399b62005fb---bitafatogoboveb.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/8915786000.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/wufewelevojusutebatade.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/rujulidobimatiwonalomuj.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/927303403.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/bekogogerojaned.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/kinudetiw.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/26681607937.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/morolapikafa.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/31237671518.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/41076582611.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/92323639900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=android+studio+memory+usagePDF 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_off0000ddf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF8 17468 bytes
SHA-256: d2b74fea4b802256a4ea367cf607d4f6ee14c2d3837e6e469d61feb74c5f43e8
font_01_sfnt_off00010b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AB 10740 bytes
SHA-256: 1e939c590503acbeb90f223bac782433198355fbf1395f24044daed83a9adc0e

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