Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d860af214c6d9a…

MALICIOUS

PDF

92.0 KB Created: 2021-09-02 11:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e43cd5ac7452c62cf3345ddf4a28c721 SHA-1: 5f2446e4f2c265ffecbcf6e11f3dc77d27b1cd88 SHA-256: f5d860af214c6d9a22b1c8b06a93e7fd5a1bacacb89adc72e10037425192662c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest it's intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://lmleadmanagement.com/userfiles/files/3156350913.pdf In PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/f8pa90skfoe9cv9nuhftll9fn9/mexiwiwe.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/waget.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65fe11ec5e---dulageterejeg.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a64aa23a90---9281372789.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/0a2d712c78e426e2e66bb042b3bf9695/zizimuvajagiv.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/60155595780.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad59a3bc173---81317033560.pdfIn PDF document text
    • http://kcobafl.org/ckfinder/userfiles/files/77491813901.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/sewet.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/3ski0ff0e1k9qi4h0hi371k461/41533053128.pdfIn PDF document text
    • http://edgecs.net/documents/73998285555.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910de5bf133---bopikafadupefamomod.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/5a0bff99f0466090d0129de66ef49bcf/58585534776.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210509023603.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611f618f166aa---zivibedotodanafuvatobeza.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/basasulekawoki.pdfIn PDF document text
    • http://axwelindia.com/uploads/vazilo.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160733332c2b51---nesuvujaxalesiwoge.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd70446129---34072867396.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/mirewoja.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///9909853783.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/92492446447.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/s1p072ecn089oso9vbcqpdvpt9/bidetesam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=21+n+pine+st+patchogue+nyPDF 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_off00010548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10548 16544 bytes
SHA-256: f94c0391e7de05b54f6465653bcc1aab40bee04b0b74aac00489364aa9e6685e
font_01_sfnt_off00013057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13057 10796 bytes
SHA-256: bd686734f1bffaba2f3298361a42e786b2fd6797bc45c33c177bdcc426d9eb49
font_02_sfnt_off0001494c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1494C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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