Malicious PDF — malware analysis report

Static analysis result for SHA-256 166a07310742afe1…

MALICIOUS

PDF

87.5 KB Created: 2021-06-30 12:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 419ecdf8608769ca58d77667936c97e8 SHA-1: 45618d735fa27dd8c62ca0c86cdbec03f61ac39f SHA-256: 166a07310742afe154ed1cc3a81db44bd3509ce69e3a8c8710da7960695fb525
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous embedded URLs that point to compromised or disposable hosting domains, likely intended to lead users to malicious content or phishing sites. No scripts were extracted from this sample, but the structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/26729237085.pdf In PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/0594657ee52397edec30223e40542b96/lukabifubojonutilutezul.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/lafopijumiwu.pdfIn PDF document text
    • http://ooexperience.be/assets/Image//files/gasesa.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/6d63c4ed351bc06462ab1a3192a51de8/39621429585.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/47189341557.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/87834753757.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/wolutupoletivelita.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd70e6dddb---vazufowedoputaji.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/rarumafogepulelinudazoda.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/pilisirubezom.pdfIn PDF document text
    • http://klpa.net/userData/board/file/rogupanenijikotanugabejal.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be0bc660dc2---31124708021.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff97177538---641793719.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/toporedutaf.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a482598de7---16552429371.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/24958997366.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160968ada656b1---tovemexeporedagibalon.pdfIn PDF document text
    • http://kme-kme.cz/files/file/82065695276.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db976dacf99---xuxaxeza.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2acf61572---14675750808.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fc8290697---74325243407.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcbd8daef1---10299582018.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a49f9180110---31156068955.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/o35q2ghrglkrrro26c8c57l1fi/178199799.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/4iriihhfagk2m6cid5qtp6ir00/nefuko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=parallel+vs+perpendicular+slopePDF 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_off0000f1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 17676 bytes
SHA-256: be1510c3afca8f1443d2004018054e3f79ab559ec18f3b04f87b832917100955
font_01_sfnt_off00012018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001382f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1382F 10576 bytes
SHA-256: 9532bd65c21f79b974ad29fd1f4e1406916452e75ee31ae85dcec6431f5e8bde