Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f3cd97522c7c73…

MALICIOUS

PDF

75.6 KB Created: 2021-07-23 03:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0ae95ab56f6bce5f2121f35436de5a0b SHA-1: c4a2f58cd64b2aefb5040618f99cb0eb655f9aa1 SHA-256: f0f3cd97522c7c73a28514c9674b74b19c08e693429cbe73654f911cd1cc4499
156 Risk Score

Malware Insights

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

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan PDF. Heuristics indicate it functions as a link farm, directing users to numerous disposable domains, many of which are hosted on compromised CMS uploads. The embedded URLs suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://dansecyr.ca/pdf/file/dunetadawuganipawoxo.pdf In PDF document text
    • http://orem.mn/uploads/files/65855169516.pdfIn PDF document text
    • https://tempatpasang.com/contents//files/xixugogipupusus.pdfIn PDF document text
    • http://chikatere.com/Upload/files/zaxisugadez.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/18169963835.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/pavewofazekoninop.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/wedusodowafuratawufid.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60B590E2D8ED4.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/modoxikebobodozeje.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c41d6c49a---sekubofugeberejebanewudal.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/28005848061.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/rebatufozat.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/52704782127.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/473mq1mva6lpdf5u14k3cpv6b5/pafafebutakewevimaki.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/66624331261.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c26590361b4---jusojasutezaserezelivulaz.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/28698784067.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160f355ed8a247---xejapazigegemezefefifexul.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/d0362478606169847f7b610df383be9f/tasonugifemivo.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e92743d4dab---65117975400.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/bapujusexajid.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160808c547fbfb---16790981533.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7cb027d3d---vefujatodidutudogogeki.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/0579c9a922365832383f04cc7c8e8a87/40536328022.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/josina.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/1433cffa50b3b202c27524042ca2e46c/89088903202.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd8af40f27---16101319526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=lunch+lines+performance+task+answersPDF 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_off0000c686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC686 10980 bytes
SHA-256: d3c368cad424a469548a4458e0ef372dab8e956fac3377b9000cd825d3ddd56d
font_01_sfnt_off0000dfe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE2 15936 bytes
SHA-256: 4bb6d97e8f3c20ca10f89049ca97e7263a6476cb83b0e4d446dc08c656330096
font_02_sfnt_off000108b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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