Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f9c53ead436daa…

MALICIOUS

PDF

87.9 KB Created: 2021-06-26 21:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1200b26ce0a6a2374981738180999878 SHA-1: 7d28ac1d0f9384e2a1ff1ef1efe4c2660848ee28 SHA-256: 03f9c53ead436daa3bae606b0ce1a1018228a1850354592abea6e589f24a47d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF acting as a link farm, directing users to compromised WordPress uploads and other potentially malicious domains. The embedded URLs suggest an attempt to redirect users to phishing or malware-hosting sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inwebjor.ru/uplcv?utm_term=national+collective+bargaining+agreement PDF link annotation
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/1c056e2f09191d4829ab698b25ec85e5/nedokosemafotofopesojumu.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/nc6dnllvjct3o2n2a5da8rcrh3/48764151537.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/kabaniwivutomogufef.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/o4d5i60brcvg8pt9mr80q0p14i/47916046719.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608436b2efbab---18118944156.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/ef3c48539952713f00256d3603702577/zuwiguvego.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/degebiwogur.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160730de131e0f---zeguvinoridafebaviwalox.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/204ca786bd7d5e5d1f2eee04b0e77457/gosusaxavaworopiv.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210511011741.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/15063415323.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d38612ce183---37862239353.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/kejalejonafi.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/bumutujupasakoramina.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/takagabotawakubifuxut.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/56583740461.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16096a763e76d3---raxetonigur.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/9daee3f4ea8fc9d7e8a3d1edeb99f0b0/79310676147.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082e6306b4ac---78952087510.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/34861729122.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/votolunogisosoxukuf.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/15659987442.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b85089f0dc6---33370035621.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/padamawawumafaneforaxile.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_off0000f1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D9 18688 bytes
SHA-256: 7fc28c81d63034bba7fc5942449baa4cab429a6559d6283612e76b623056ae3f
font_01_sfnt_off000121d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139EE 10588 bytes
SHA-256: 982838f6bbf720fb87f59c8f5a85beff1c0ea07a16a5872047b3477e88aa1cd3

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