Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11b23bea2215aea…

MALICIOUS

PDF

85.9 KB Created: 2021-09-07 00:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bf77015f6734a78b74fdf6c2cbd74244 SHA-1: 5f0b676a6511ff3786924bd77d36e7c842386d8e SHA-256: b11b23bea2215aea039a342f03f7852f96a318f0068998acd21d7eeb281b0d54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable domains, likely intended to lure users into clicking malicious links. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ba310b66071ad8d982403a185acaea1a/kuxenapopate.pdf In PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/77401786537.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7f9776a2c---38049234195.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/14153357524.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/6365515748.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608ceb081e81a---jubibewugomimadepij.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611f7ce5a39f3---jetepoviwosabewaz.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b88e11ea0a---74514180858.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/a00b99247a6f51835baef15638c4e4eb/pebajuzavulaviziv.pdfIn PDF document text
    • http://snypes.nl/img/customer//files/68701206007.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/musatudikajinuxa.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/duzade.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/7db31b951b5d0270b285beb2598251c1/kadetebisawitojagebow.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/216e803a697df73b65a38d5c0080bddd/bozeweniwodiruxoride.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/260d8a2dcc6ef02db1f6659a4ee3859d/24396807513.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/dovetibalosi.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/dinebutepuguwasepagebap.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/sifutatiwowasuwebirujunob.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/02b336d9827f1d2d604b44ea8b644804/44804015954.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/36263346654.pdfIn PDF document text
    • http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/63001912505.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/zupono.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/teranopusomuxudi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=home+workout+routine+pdfPDF 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_off0000eaa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA7 10552 bytes
SHA-256: befb4700939191854d35b4cce340d14d684d55f64dfe6dfe76eadb43e2a8e33f
font_01_sfnt_off000102a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A8 18424 bytes
SHA-256: 07e932f39f1fd39c2b7f33c057cdd8d85931d778ee22abb0af612706a70b30b5
font_02_sfnt_off00013241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13241 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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