Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f26c7989934b8c0…

MALICIOUS

PDF

83.9 KB Created: 2021-09-11 17:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5c0479cb91b10fc4460dacddce1d234c SHA-1: 055202d517360fd2da3afcafbefd60f506db4ef8 SHA-256: 0f26c7989934b8c07251448a32ba3d6239d47aabf0b85435ad8bb8f7d9a5578e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'SE_URGENCY_LURE' suggests the document may contain deceptive text, but the primary malicious activity observed is the distribution of links to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://laborke.ru/uplcv?utm_term=can+someone+know+if+you+visit+their+profile+on+instagram PDF link annotation
    • http://orosweb.hu/ckfinder/userfiles/files/81432287087.pdfIn PDF document text
    • https://bdata.vn/upload/files/61688070471.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/feluk.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/kuvifalopamirodigepirufur.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/19374333734.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tiridofakuguvopof.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/a64598e402171b20d91d86ed3887ab7f/1900649225.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/36576714650.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161317923e2379---80695032836.pdfIn PDF document text
    • https://sitarasign.ir/data/file/mukizisejonelavuwiwuzik.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139717483d5e---61609699551.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/9212715319.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/sizofumesexega.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210906130554.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/10038368724.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/70167667501.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/51996730225.pdfIn PDF document text
    • http://wwsm-us.com/files/file/46140739390.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/fuxituxajenatifegaxig.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210909062103.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/rileziwipumus.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139b53f74d67---35644772292.pdfIn PDF document text
    • http://halanmilk.com/upload/files/nogugokixon.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/83725483346.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/wavumezuforesam.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/26826750167.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_off0000e18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A2 11296 bytes
SHA-256: 58166f376bd43e9ef9c6215aa284c77d922a852a73b395ac2b5d038526b23fce
font_02_sfnt_off0001141b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141B 17440 bytes
SHA-256: c091422c7458edbaa066fa8192570bcfdce0c3a3758d60463ca4729f4684c30f

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