Malicious PDF — malware analysis report

Static analysis result for SHA-256 b23c45ef77733f9e…

MALICIOUS

PDF

87.7 KB Created: 2021-09-03 03:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c45195ce6118fd78ed0afc04cbbe1a57 SHA-1: 069ff2ac32609067c9ef4be0ca0a51912776f64f SHA-256: b23c45ef77733f9e8cb514f69ae6cf2da625f992e8c4eb5c4acb06c06da757c0
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable domains, suggesting an attempt to lure users to malicious sites. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://bensonlandscape.com/editorData/file/xonulukuruzotonijipomeru.pdf In PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a34b98c5cd6---74286288462.pdfIn PDF document text
    • http://grotech.in/userfiles/file/pakezesaf.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/22561597086.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160be74d43e590---29750157337.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/gipogiwalidubajub.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/tilenidow.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/jegofalegokejibuwa.pdfIn PDF document text
    • http://griby.biz/ckfinder/userfiles/files/gokarerikuririmonemaku.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/dobugedifagavowupat.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c5157d460---2067063271.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/gejinidokimuxozeliwevaz.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/6fdqei5hta7oh0omk37952tb15/16298628299.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9de387b82---sinamadozojeremufabit.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612e1cb399b60---masosanitorilojowoloz.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/2931db4d88387e0b78f25fa119a611b5/71571686656.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/rokevifedi.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b0845b627ce---xaritujuworovijopetuba.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/387ddb40d9929300bbdb67f6b2235ebc/97473765645.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/d4d1d4bceb6ba4e0a0f1eb6e1a5fa3a7/nigurojig.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/bpvv9qktbk0u1ig7ui3tavlafd/xulabikida.pdfIn PDF document text
    • https://nasikampung.info/contents//files/45718971632.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c43bc703a---fagetalawipipasepunixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+woman+in+black+book+susan+hill+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_off0000eead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAD 18692 bytes
SHA-256: dc633d885fb22ce94d2eebdec54c63ddbc4487f22907967ebf08ad48623ecde6
font_01_sfnt_off00011f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8C 11068 bytes
SHA-256: 7275008387dffc10addfd485e67ddb6633b8322bd0fd12b1c450292ea8e9723c
font_02_sfnt_off000138f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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