Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b1faf15400abcc…

MALICIOUS

PDF

80.6 KB Created: 2021-09-07 03:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 875022d070979d487d6a7b97eebb3ce6 SHA-1: 8a87117e5190006fa05fa67d82ba5088748868d8 SHA-256: 05b1faf15400abcc00bd69466a4978df3f3fcffd80de13872fc3658f2720d19e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://infrive.ru/uplcv?utm_term=little+house+in+the+big+woods+full+book+pdf PDF link annotation
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a315263be11---fizopelurimumaxujelig.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/jolit7ab8hjuhup3fs2ldmc2ip/gibugolepagadizevamozo.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/xaluseludatov.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/moxofawigizuzapurutob.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/74610908268.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/paregoxapegovinomawok.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/lasaragedavujawutatemojo.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/pixepulolebusujufulegaza.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/mamagezozegirirug.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/bdbd168d5da1ed6cc1874792850a4b9e/sexufofajova.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/zemupodemo.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/dedafosonovil.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16087974c8da52---sumedubatajas.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021081215595473499.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd587999d7---94939290969.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/408504de51c80e0558bf292e260c4a3b/20113541937.pdfIn PDF document text
    • http://goldmustang.com/files/files/sidinokad.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/vuwilosojikudufe.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/16621992916.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607902608c1ac---56663205168.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/seduxatesagazagelaziro.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/31998931108.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_off0000d799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD799 16996 bytes
SHA-256: 6ddb6741dfe119ee5239de81e964f3e392283aaba085e28759fbb3aee886ab0c
font_01_sfnt_off0001037f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037F 10888 bytes
SHA-256: fceeb77e3c6dcb995e20dda76991ce22f49bbae3eb01856daf7bb108b30076aa
font_02_sfnt_off00011c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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