Malicious PDF — malware analysis report

Static analysis result for SHA-256 978c6fd43d95dedd…

MALICIOUS

PDF

85.6 KB Created: 2021-09-17 21:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9605fa9b4c59edaa156d99681c95e8b0 SHA-1: 7a8f1edc0f3af026fb5935c9fbfe03f520f11421 SHA-256: 978c6fd43d95dedd4d27799b3fb68165b5544c3f3ac3abf7c20bc0b769423d77
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external malicious content, likely as a first stage in a phishing or malware delivery chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://slavutich-media.ru/userfiles/file/zajemunoximaxibura.pdf In PDF document text
    • http://sklepjola.pl/userfiles/file/napasexigajemudaju.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/db0ec9b2830dbd909cd244307c6775af/sasotezun.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///10259652973.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/mezufu.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/4064324426136b9cda0185.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/gosinuraxuta.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/46857412593.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/83638706409.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/68f9c94f4c4f6d50f9d6d4146a2e47bc/rikasimu.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/bizafuzaxavuwiziguk.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/xilunojezixijorusujazep.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/25478616971.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/4810579529.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210913213052.pdfIn PDF document text
    • https://el-tall.pl/pics/file/xiviwubero.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1631339796.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/13471788886.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/9587555819.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16140becb78145---93637362820.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/rusekuga.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/verek.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/19800308066.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/didarul.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/domamunaxuwelub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=android+10+newsPDF 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_off0000ecfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFC 10176 bytes
SHA-256: 95b6bdd62d92d4705c7ce7bd904959bf139de6dafa4e136c81dd02b747122333
font_01_sfnt_off000103f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F5 17296 bytes
SHA-256: e2d08db902ef3889b3a6a31c07ed7209ccb49f2e7fe16b99d145e03f719a52b3
font_02_sfnt_off000130aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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