Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4712322380e7ae…

MALICIOUS

PDF

82.9 KB Created: 2021-09-16 20:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8303d399eb6f898ad4acb3aabd041b61 SHA-1: 206f819fe108807425cb56d94f048545fa16f375 SHA-256: ef4712322380e7ae7ffad0f4b4d27bb800c36cf76c73627f6f0942fc8d7bc7af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URIs and the nature of the heuristics strongly suggest the document's purpose is to redirect users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=android+share+folder PDF link annotation
    • https://izr.fr/files/bowekovemuginitofinabo.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381e9505f91---merepi.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/netafamage.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/ridejurusulolepi.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/30c7f771187b315f620f738d8fb69833/razekojijusuj.pdfIn PDF document text
    • http://medica-brno.com/files/88617450289.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/91551205598.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/wafojapuzuzir.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/31c76292583773e64e3250f25f302fda/5674298635.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/60144565674.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-01/images/files/safikinuta.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/49865056703.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/90b263dc9c12d9dffabd028692b2820a/sidutefutubebanuxidoli.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/37688838715.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/74916909386.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/42934737621.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/pavokezawubobemejoju.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/buvilunupijawififozimapuz.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/44347144955.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/nomomanutuvini.pdfIn PDF document text
    • http://195exim.com/datas/files/19880937899.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/35308760464.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613446500bd38---52459051330.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/15542813131.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/63212961824.pdfIn PDF document text
    • 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_off0000e15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15E 10336 bytes
SHA-256: 6542f3c3f0f5d6f01a72a9ca80ffe2aeed95951c7ac1b2d7d23ba98f3b0ea61b
font_01_sfnt_off0000f88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88F 17448 bytes
SHA-256: 4d3e040032aa0404bcbba9f86b88a4dc4f44786f50aaa1b3f0eb0c3d5afee535
font_02_sfnt_off0001263b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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